1 4Substrate Type: Concrete Concrete needs to be structurally sound and dry to the touch. Concrete should have aged for a minimum of 2 weeks before starting any roofing works. 2Reroofing




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Name1 4Substrate Type: Concrete Concrete needs to be structurally sound and dry to the touch. Concrete should have aged for a minimum of 2 weeks before starting any roofing works. 2Reroofing
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Firestone EPDM Roofing System for Extensive Green Roofs

The specifications herein described are general guidelines created from information provided to Firestone Building Products by project specifiers and design professionals. Also the system design needs to comply with national regulations and installation specifications. They are intended to facilitate and assist in the selection of roof materials, not as a substitute for the judgment of a design professional. The ultimate selection of a specification for a particular roof remains the responsibility of the building owner and their design professionals.

For the build-up of the green roof layers on top of the EPDM membrane we refer to the green roof designers and/or specialists.

When also a Photovoltaic System will be installed in combination with this green roof, please also consult our specifications for EPDM Enviro-Ready Roofing Systems.

1Preparation of the Roof Substrate

1.1New Roof

1.1.1General


Roof slope should be a minimum of 2% to allow for adequate drainage of the roof taking into account the deflection of the roof.

The roof surface will be made clean, dry, smooth and free of contaminants such as grease, animal fats, coal tar and oil based products. All sharp edges, fins and rough surfaces that could damage the membrane will be removed or if they can't be removed, isolated from the membrane with a leveling layer.

It is essential that the roof structure is capable of supporting the imposed load of the new roofing system, also taking the saturated condition of the green roof into account. When necessary, the advice of a Structural Engineer should be sought in this respect.

1.1.2Substrate Type: Metal Decking


Metal decks require a minimum thickness of 0.75 mm for galvanized steel. Deck should be installed without inducing stresses (over-stretching/compressing) that could cause the flutes to bend. The deck should be fixed to the substrate using sufficient fasteners as per the manufacturer's specifications.

1.1.3Substrate Type: Wooden Decks


The deck needs to consist of wooden boards with a minimum thickness of 18 mm. Thickness of the boards depends on the distance between the purlins. Wooden panels should be kept dry before and during the waterproofing works.

1.1.4Substrate Type: Concrete


Concrete needs to be structurally sound and dry to the touch. Concrete should have aged for a minimum of 2 weeks before starting any roofing works.

1.2Reroofing

1.2.1General


Roof slope should be a minimum of 2% to allow for adequate drainage of the roof taking into account the deflection of the roof.

All outlets must be protected to prevent debris entering and causing blockage of down pipes.

The roof surface will be made clean, dry, smooth and free of contaminants such as grease, animal fats, coal tar and oil based products. All sharp edges, fins and rough surfaces that could damage the membrane will be removed or if they can't be removed, isolated from the membrane with a leveling layer.

It is essential that the roof structure is capable of supporting the imposed load of the new roofing system, also taking the saturated condition of the green roof into account. When necessary, the advice of a Structural Engineer should be sought in this respect.

1.2.2Substrate Type: Metal Decking


Metal decks require a minimum thickness of 0.75 mm for galvanized steel. Metal decks will be inspected for their deflection and assessed for their pullout resistance when necessary.

1.2.3Substrate Type: Wooden Decks


The deck needs to consist of wooden boards with a minimum thickness of 18 mm. Thickness of the boards depends on the distance between the purlins. Wooden decks will be fully examined for their quality (dryness) and pullout resistance. Any wet or unsound portions will be replaced with new material prior to the installation of the membrane system.

1.2.4Substrate Type: Concrete


Concrete needs to be structurally sound and dry.

1.2.5Existing Membrane: Smooth Bitumen


All debris and non-adherent areas of the existing bitumen roof finish will be removed. Blisters and buckles will be cut open and sealed, defects will be repaired by gentle warming and redressing.

1.2.6Existing Membrane: Granule Surfaced Bitumen


All chippings, debris and non-adherent areas of the existing bitumen roof finish will be removed from the surface. Blisters and buckles will be cut open and sealed, defects will be repaired by gentle warming and redressing.

A separation layer of geotextile (min. 200 gr/m²) or an insulation board or a half-inch (12.7 mm) thick Firestone ISOGARDTM HD Cover Board or equivalent will be installed prior to the installation of the roofing membrane.

1.2.7Existing Membrane: Thermoplastic Membrane


The existing thermoplastic membrane will be cut at the perimeter and all flashings will be removed from the upstands and penetrations. When necessary, the membrane will be cut at equidistant intervals to release the tension out of the membrane.

A separation layer of geotextile (min. 200 gr/m²) or an insulation board or a half-inch (12.7 mm) thick Firestone ISOGARDTM HD Cover Board or equivalent will be installed prior to the installation of the roofing membrane.

1.2.8Existing Membrane: EPDM Membrane


All debris will be removed from the existing roof surface. All non-adherent parts of the existing EPDM membrane at upstands and penetrations will be removed.

A separation layer of geotextile (min. 200 gr/m²) or an insulation board or a half-inch (12.7 mm) thick Firestone ISOGARDTM HD Cover Board or equivalent will be installed prior to the installation of the roofing membrane.

2Vapour Control Layer

2.1General


The necessity, type and thickness of the vapour control layer need to be determined based upon the designation of the building and the regional climatic conditions.

All installations need to be in accordance with the recommendations of the manufacturer and the method of fixation needs to be adapted to both the substrate and the roofing system to be installed.

Dress to provide sufficient edge protection to new thermal insulation at perimeter, abutments and details etc.

3Insulation & Cover Board

3.1General


Use insulation boards with a high compressive strength. If necessary a half-inch (12.7 mm) thick Firestone ISOGARDTM HD Cover Board or equivalent will be installed on top of the insulation.

The thermal resistance of the total package of insulation and cover board requires minimum R-value of … m²K/W (check your local and/or National Standards).

3.2Insulation Type

3.2.1Mineral Wool (MW)


Mineral wool boards have a minimum compressive strength of 40 kPa; UEAtc class C.

In case of a fully adhered membrane application, install a suitable overlayment (e.g. a half-inch (12.7 mm) thick Firestone ISOGARDTM HD Cover Board or equivalent) prior to the installation of the EPDM membranes.

3.2.2Perlite (EPB)


Perlite boards have a minimum compressive strength of 200 kPa.

In case of a fully adhered membrane application, install a suitable overlayment (e.g. a half-inch (12.7 mm) thick Firestone ISOGARDTM HD Cover Board or equivalent) prior to the installation of the EPDM membranes.

3.2.3Polyurethane (PUR)


Polyurethane boards have a minimum compressive strength of 120 kPa with an acceptable facer with sufficient delamination strength.

3.2.4Polyisocyanurate (PIR)


Polyisocyanurate boards have a minimum compressive strength of 120 kPa with an acceptable facer with sufficient delamination strength.

3.2.4.1Firestone ISO 95+ GL


Manufacturer needs to be ISO 9001:2008 and ISO 14001:2004 certified. The foam technology does not contribute to the depletion of the earth's ozone layer (zero ODP) and uses a HCFC-free blowing agent.

Firestone polyisocyanurate insulation boards consist of closed-cell polyiso foam core laminated on both sides to a black glass reinforced mat facer of app. 150 g/m². The boards will comply with the following characteristics when tested in accordance with ASTM Test Method:

- Dimensions: 1.22 m x 2.25 m

- Thickness: from 25.4 mm to 101.6 mm

- Compressive strength: >= 20 psi or 138 kPa

- Thermal conductivity: <= 0.167 BTU/(h x sqft x °F)

Keep insulation dry at all times. Do not install over wet, damp or uneven substrates.

The insulation boards comply to following certifications, but not limited to: CE marked according to EN 13165, ASTM C1289 Type II Class 1, UL Classified, FM Class 1 Approved.

3.2.4.2Firestone RESISTA AK


Manufacturer needs to be ISO 9001:2008 and ISO 14001:2004 certified. The foam technology does not contribute to the depletion of the earth's ozone layer (zero ODP) and uses a HCFC-free blowing agent.

Firestone polyisocyanurate insulation boards consist of closed-cell polyiso foam core laminated on both sides to a gastight multi-layered aluminium complex. The boards will comply with the following characteristics when tested in accordance with EN 13165:

- Dimensions: 1.2 m x 0.6 m,

1.2 m x 1.2 m,

1.2 m x 2.4 m

- Thickness: from 30 mm to 140 mm

- Compressive strength: >= 150 kPa

- Thermal conductivity: <= 0.023 W/mK

Keep insulation dry at all times. Do not install over wet, damp or uneven substrates.

The insulation boards comply to following certifications, but not limited to: CE marked according to EN 13165, FM Class 1 Approved.

3.2.5Expanded polystyrene (EPS)


Expanded polystyrene boards have a minimum compressive strength of 120 kPa.

Direct contact between polystyrene boards and contact adhesives and/or primers must be avoided.

In case of a fully adhered membrane application, install a suitable overlayment (e.g. a half-inch (12.7 mm) thick Firestone ISOGARDTM HD Cover Board or equivalent) prior to the installation of the EPDM membranes.

3.2.6Extruded polystyrene (XPS)


Extruded polystyrene boards have a minimum compressive strength of 300 kPa.

Polystyrene boards are meant to be used in inverted roof systems and thus can only be installed on top of the EPDM membrane.

3.3Cover Board Type

3.3.1ISOGARD HD


Manufacturer needs to be ISO 9001:2008 and ISO 14001:2004 certified. The foam technology does not contribute to the depletion of the earth's ozone layer (zero ODP) and uses a HCFC-free blowing agent.

Firestone ISOGARD HD is a high-density, closed-cell, polyisocyanurate board with a coated fiberglass facer on both sides designed for use as a cover board. The boards will comply with the following characteristics when tested in accordance with EN tests:

- Dimensions: 1.22 m x 2.25 m

- Thickness: 12.7 mm

- Weight: 1.8 kg/m²

- Thermal Resistance (LTTR R-value): 2.5

- Compressive strength: >= 120 psi or 800 kPa

Keep cover board dry at all times. Before board is placed on the roof deck, the surface must be clean, dry, free of debris, water, ice or snow and suitably prepared.

3.3.2DensDeck Roof Board


DensDeck Roof Board exists of a high-density gypsum core, bonded on front and back with fiberglass mats. The boards provide an excellent fire barrier, wind-uplift properties, flute spanning that stiffens and provides increased foot traffic resistance to the roof deck. The boards will comply with the following characteristics:

- Dimensions: 1.22 m x 2.44 m

- Thickness: 6.4 mm, 12.7 mm, 15.9 mm

- Weight: 5.9 kg/m², 9,8 kg/m², 12.2 kg/m²

- Compressive strength: >= 900 psi

Keep cover board dry at all times. Before board is placed on the roof deck, the surface must be clean, dry, free of debris, water, ice or snow and suitably prepared.

3.4Attachment of Insulation and/or Cover Boards

3.4.1Thermal Insulation loose laid (for Ballasted/Inverted System only)


Install the boards on above underlay, loose laid with end joints staggered. When installing two layers of insulation boards, ensure that the joints of both layers do not coincide. Install fully in accordance with manufacturers instructions.

Install in any one day only as much boards as can be protected by the completed roofing system that same day.

3.4.2Thermal Insulation and/or Cover Boards mechanically attached


Install the boards on above underlay with end joints staggered. When installing two layers of insulation boards, ensure that the joints of both layers do not coincide. Mechanically fix to pattern and frequency advised by manufacturer, all in accordance with national wind uplift standards. Install fully in accordance with manufacturers instructions. Use Firestone insulation plates and fasteners or equivalent.

Install in any one day only as much boards as can be protected by the completed roofing system that same day.

3.4.3Thermal Insulation and/or Cover Boards adhered


Install the boards on above underlay with end joints staggered. When installing two layers of insulation boards, ensure that the joints of both layers do not coincide. Adhere the boards using Firestone Twin Pack Insulation Adhesive or an equivalent adhesive system, according a pattern as advised and approved by manufacturer, all in accordance with national wind uplift standards. Firestone insulation boards shall not be larger than 1.2 m x 1.2m. Install fully in accordance with manufacturers instructions.

Install in any one day only as much boards as can be protected by the completed roofing system that same day.

3.4.4Thermal Insulation Boards inverted roof


Install XPS boards loose laid over membrane with end joints staggered. Install fully in accordance with manufacturers instructions. The installation of a vapour open separation layer (geotextile) between the insulation and the green roof is required. The insulation boards must be immediately (temporarily) ballasted after installation.

4Firestone EPDM Roofing Membrane

4.1Products


EPDM Membrane and accessories need to be supplied from the same manufacturer. Manufacturer needs to be ISO 9001:2008 and ISO 14001:2004 certified.

4.1.1Roofing membrane: Firestone RubberGardTM EPDM low slope fire retardant 1.5 mm (0.060”)


The Firestone RubberGard EPDM low slope fire retardant membrane is a 100% cured unreinforced roofing membrane made of a synthetic rubber Ethylene-, Propylene-, Diene terpolymer. The sheet is made of two plies of low slope fire retardant compound and is factory-assembled into large, fully vulcanized seamless membranes. The membrane can be supplied in the following dimensions:

Specific weight: 1230 kg/m³

Length: 15.25 m; 30.5 m; 45.75 m; 61.00 m

Width: 2.28 m; 3.05 m; 5.08 m; 6.10 m;

7.62 m; 9.15 m; 12.20 m; 15.25 m

Dimension of the membrane will be chosen in view of the dimensions, complexity of the roof, the application method chosen and the experience of the installer.

The membrane complies with the following characteristics when tested in accordance with ASTM Test Method:

- Tensile strength: >= 9.0 MPa

- Elongation, ultimate : >= 300%

- Tear Resistance: >= 26.3 kN/m

- Brittleness Point: >= -45 °C

- Ozon Resistance: no cracks

- Durability/UV-exposure: Pass EN 1297 (>7500h)

- Heat Aging:

- Tensile Strength: >= 8.30 MPa

- Elogation, ultimate: >= 200%

- Tear Resistance: >= 21.9 kN/m

The membrane has been assessed for its properties according to EN 13956 (CE mark), ASTM D-4637 (Type I), DIN V 20000-201, is FM approved and carries following certificates, but not limited to: BBA, ATG, KOMO, DTA, ETN, Sintef, DIT, AbP.

4.2Roofing System


Ponding water, snow, frost and/or ice present in more than trace amounts, must be removed from the work surface prior to installing the system.

For larger roof surfaces it is highly recommended to divide the roof in several compartments. The different installed compartments will be indicated on the roof plan.

4.2.1Fully Adhered System (recommended)


Place the Firestone RubberGard EPDM membranes (without stretching) over the acceptable substrate as close to its final position as possible, and allow to relax a minimum of 30 minutes before attachment or splicing. Install the Firestone RubberGard EPDM single-ply roofing membrane fully bonded to the compatible substrate with solvent or Water Based Bonding Adhesive. Each panel shall overlap the adjoining one by 100 mm minimum.

The adhesives must be roller applied in a thin even coat on both mating surfaces. Allow sufficient time for the adhesive to flash off before mating the surfaces. All strictly in accordance with Firestone specifications.

Water Based Bonding Adhesive can be applied in a single coat directly onto OSB or plywood after which the EPDM can be mated to the substrate while the adhesive is still wet. Do not use Water Based Bonding Adhesive when there is a possibility of freezing temperatures within 48 hours of application. All strictly in accordance with Firestone specifications.

4.2.2Ballasted System (only for roof slopes < 5%)


Install the Firestone RubberGard EPDM single-ply roofing membrane, loose laid on a suitable substrate as close to its final position as possible, and allow to relax a minimum of 30 minutes before attachment or splicing. Each panel shall overlap the adjoining one by 100 mm minimum.

The EPDM membranes must be (temporarily) ballasted immediately after installation.

The EPDM membranes must be sufficiently ballasted, strictly calculated in accordance with local standards for wind uplift, but always with min. 50 kg/m². If the substrate of the green roof is resistant against erosion, the weight of the green roof (in dry condition) may be taken into account. If necessary additional ballast must be installed.

When the green roof is removed, another (temporary) layer of ballast must be installed.

4.2.3Inverted System (only for roof slopes < 5%)


Install the Firestone RubberGard EPDM single-ply roofing membrane, loose laid on a suitable substrate as close to its final position as possible, and allow to relax a minimum of 30 minutes before attachment or splicing. Each panel shall overlap the adjoining one by 100 mm minimum.

The EPDM membranes must be (temporarily) ballasted immediately after installation.

The EPDM membranes must be sufficiently ballasted, strictly calculated in accordance with local standards for wind uplift and in accordance with manufacturers' instructions, but always with min. 50 kg/m². If the substrate of the green roof is resistant against erosion, the weight of the green roof (in dry condition) may be taken into account. If necessary additional ballast must be installed.

When the green roof is removed, another (temporary) layer of ballast must be installed.

4.3Roof Details

4.3.1General


Vulcanized EPDM will be used wherever possible for the flashing of the details and this always in accordance to the Firestone Technical Guidelines.

Around all perimeters and around each roof detail, a green-free zone of app. 50 cm wide must be foreseen. In these zone(s) the vegetation will be replaced by gravel or a row/rows of tiles.

Use smooth, river-washed ballast with rounded edges and corners preferably between 20 mm - 40 mm nominal diameter. The diameter of the gravel is also depending on the height of the roof.

4.3.2Seaming

4.3.2.1Splicing (FLL/EN 13948 approved)


The membrane is joined with a 75 mm wide, self-adhesive QuickSeamTM Splice Tape and bonded using Firestone QuickPrime Plus. Roll seams with a 50 mm silicone rubber roller or the QuickRoller. Layout the Firestone RubberGard EPDM membranes in a fashion so that field and flashing seams are installed to shed water.

In addition the edge of the horizontal tape seams must be covered with Pourable Sealer (min. 50 mm wide and 5 mm thick) over their entire length. The membrane will be primed with QuickPrime Plus prior to the application of Pourable Sealer.

4.3.2.2Splicing (alternative)


The membrane is joined with a 75 mm wide, self-adhesive QuickSeamTM Splice Tape and bonded using Firestone QuickPrime Plus. Roll seams with a 50 mm silicone rubber roller or the QuickRoller. Layout the Firestone RubberGard EPDM membranes in a fashion so that field and flashing seams are installed to shed water.

On top of the EPDM membranes a PE-sheet (LDPE, min. 0.4 mm) will be installed with an overlap of min. 1 meter.

4.3.3Base Tie-in


At all changes in angles greater than 15%, the membrane must be restrained using one of the approved 'Base Tie-in' methods as per the Firestone specifications.

4.3.3.1Detail 1: Self-adhesive QuickSeam Reinforced Perimeter Fastening Strip


Install the self-adhesive QuickSeam RPFS (Reinforced Perimeter Fastening Strip) at the base of the upstand, mechanically attached to the substrate with an appropriate fastening system as per Firestone specifications.

The strip will be attached to either the deck, or the wall. The selection for vertical or horizontal attachment is related to the ease of application (thickness of insulation and nature of the substrate). The strip will be mechanically attached each 300 mm minimum. The membrane will then be adhered to the strip using QuickPrime Plus.

Alternatively, and only for roofs smaller than 100 m², the mechanical attachment of the EPDM membrane may be replaced by the adherence of the EPDM membrane to the (compatible) horizontal substrate for min. 20 cm, starting at the perimeter. Insulation and/or Recovery boards needs to be fixed here, all in accordance with national wind uplift standards. Install fully in accordance with manufacturers instructions. Use Firestone insulation plates and fasteners, Firestone Twin Pack Insulation Adhesive or equivalent. Solid concrete tiles (no gravel) need to be installed on top of the EPDM membranes over a distance of 50 cm starting from the angle change.

4.3.3.2Detail 2: Batten bar and separate EPDM, QuickSeam SA Flashing or QuickSeam FormFlash


The membrane shall be mechanically attached using a metal batten bar and approved fasteners as per Firestone specifications either on the flat roof substrate or onto the wall. The selection for vertical or horizontal attachment is related to the ease of application (thickness of insulation and nature of the substrate). The strip will be mechanically attached each 300 mm minimum.

Alternatively, and only for roofs smaller than 100 m², the mechanical attachment of the EPDM membrane may be replaced by the adherence of the EPDM membrane to the (compatible) horizontal substrate for min. 20 cm, starting at the perimeter. Insulation and/or Recovery boards needs to be fixed here, all in accordance with national wind uplift standards. Install fully in accordance with manufacturers instructions. Use Firestone insulation plates and fasteners, Firestone Twin Pack Insulation Adhesive or equivalent. Solid concrete tiles (no gravel) need to be installed on top of the EPDM membranes over a distance of 50 cm starting from the angle change.

4.3.4Vertical flashings roof edges and penetrations


Vertical facings are completed using EPDM, QuickSeam SA Flashing or QuickSeam FormFlash, fully bonded to the vertical face using (Water Based) Bonding Adhesive in case of EPDM membrane or using QuickPrime Plus in case of a QuickSeam product. If needed, install a suitable overlayment (e.g. a PUR/PIR insulation board with an acceptable facer and sufficient delamination strength, a half-inch (12.7 mm) thick Firestone ISOGARDTM HD Cover Board or equivalent) to ensure the adherence.

Where possible, provide a minimum design height of at least 150 mm for all flashing terminations. Do not flash over existing through-wall flashings, weep holes and overflow scuppers.

4.3.5Corners


Internal and external corners are to be flashed using self-adhesive QuickSeam FormFlash with QuickPrime Plus. All in accordance with Firestone specifications.

Preferable inside corners are being executed by folding and restraining the excess of EPDM membrane.

4.3.6Wall Termination

4.3.6.1Termination Bar


The membrane will be secured with a Firestone termination bar, used in conjunction with Firestone water repellent sealant Water Block between the membrane and the substrate under compression behind the termination bar, mechanically fixed at maximum 200 mm centers using appropriate fasteners. A bead of Firestone Lap Sealant is applied along the top edge of the termination bar.

4.3.6.2Counterflashing


The EPDM membrane will be mechanically fastened using an appropriate fastening system. A proprietary flashing is secured to the vertical face above the membrane termination.

The counterflashing will cover the top of the fastening system by a minimum of 100 mm.

4.3.7Roof Edge Termination

4.3.7.1Metal Coping Terminations


The membrane shall be returned over the upstand and fully bonded using (Water Based) Bonding Adhesive and secured to the horizontal face of the parapet. If necessary, a suitable timber plate will be installed, mechanically fixed to the top of the parapet to provide an even substrate. The metal coping will be installed, ensuring full protection of the top of the upstand detail.

4.3.7.2Concrete Coping Terminations


The membrane will be returned and fully bonded over the upstand using (Water Based) Bonding Adhesive and secured to the top horizontal surface of the upstand.

Stop the EPDM flashing sufficiently from the wall edge, without putting the water tightness into danger, so as to allow a good adhesion of the mortar to the wall.

The coping stone will be installed, ensuring full protection of the top of the upstand detail.

4.3.7.3Metal Roof Edge


Allow the field membrane to pass over the edge by a minimum of 100 mm and fully adhere it to the front of the perimeter edge over the complete length. If necessary, install a wood nailer at the roof edge to provide a suitable edge detail.

Install the appropriate metal edge profile fastened to roof edge at 100 mm centres, using appropriate fasteners. The horizontal flange of the metal profile shall be flashed using 125 mm wide Firestone self-adhesive QuickSeam Flashing. Ensure an adequate overlap of 75 mm beyond the inner edge of the profile.

4.3.8Pipe Penetrations

4.3.8.1Self-adhesive QuickSeam Pipe Flashing


Pipe penetrations accessible from the top side and with a maximum diameter of 150 mm, can be flashed in using Firestone prefabricated self-adhesive QuickSeam pipe flashing. Install in accordance with Firestone specifications.

4.3.8.2Self-adhesive QuickSeam FormFlash


Field fabricated flashing of pipes is to be executed using Firestone QuickSeam FormFlash, bonded using Firestone QuickPrime Plus. Apply a bead of Firestone Lap Sealant at all cut edges of flashing. This method is to be used where the top of the pipe is not accessible and/or the pipes are larger than 150 mm in diameter. All penetrations must allow flashing terminations of a minimum 150 mm above the roof membrane level.

4.3.8.3Pipe Clusters and Unusual Shaped Penetrations


Install a QuickSeam Penetration Pocket kit around the penetrations or create pre-fabricated metal penetration pockets flashed in with Firestone QuickSeam FormFlash. Fill penetration pockets with Firestone Pourable Sealant, so as to shed water. The Pourable Sealant shall be a minimum of 50 mm deep, use filler as required. All installed in accordance with the Firestone specifications.

4.3.9Water Drains


Number and dimensions of the outlets are in accordance with national regulations.

4.3.9.1Rainwater Outlets incorporating a Clamping Ring


Install roof outlets, providing a clean even finish on the mating surfaces between the clamping ring and the drain bowl.

Position the membrane, and then cut a hole for the outlet to allow 20 mm of membrane to extend inside the clamping ring past the drain bolts. Install Firestone water repellent sealant Water Block beneath the membrane, where the clamping ring seats. Install the outlet clamping ring and clamping bolts. Tighten the clamping bolts to achieve constant compression and install gravel/leaves guard.

4.3.9.2Rainwater Outlets incorporating an Insert Piece


The field EPDM membrane sheet must be in place prior to installation of the drain insert.

Cut a hole to the size of the insert piece, over the centre of the outlet. Install drain insert piece and apply a layer of Water Block between the flange of the insert piece and the EPDM membrane.

The flange of the insert piece must have a smooth structure and shall be fastened every 100 mm centers using an appropriate fastening system.

Flash over with QuickSeam FormFlash or QuickSeam SA Flashing, extending 75 mm minimum onto the field membrane and 75 mm past the fasteners. Cut a circular hole in the QuickSeam FormFlash or QuickSeam SA Flashing above the drainpipe 20 mm larger than the diameter to allow application of a Lap Sealant.

4.3.9.3Through wall Scupper Outlets incorporating a "Scupper" Insert Piece


The field sheet must be in place prior to installation of the scupper insert. Set the welded scupper insert in Firestone water repellent sealant Water Block and secure to the structure with appropriate fasteners.

Flash with QuickSeam FormFlash, overlapping all edges by 75 mm minimum and fastener heads 75 mm minimum. Finish the detail with Lap Sealant.

4.3.10Roof expansion joints

4.3.10.1Roof expansion joints (in case of a Fully Adhered System)


The membrane is mechanically attached at both sides of the expansion joint using an appropriate fastening system. The expansion joint is then covered with a second piece of non-reinforced EPDM membrane. A compressible tube is added to allow for excess membrane. Ensure there is enough excess membrane to accommodate building movement.

Flash all seams crossing the expansion joint using a strip of QuickSeam FormFlash as per Firestone specifications.

4.3.10.2Roof expansion joints (in case of a Ballasted or Inverted System)


The membrane can be loose-laid over a flat expansion joint in the roof deck. The elasticity of the membrane will accommodate for the movement of the structure.

4.3.11Walkway Pads


Walkways shall be installed in specific areas such as access points to the roof (doorways, ladders,…) and on roof parts subjected to traffic more frequent than once per month.

Prepare the mating surface of the EPDM membrane with QuickPrime Plus. Pre-cleaning with Clear Splice wash may be required. Install Firestone QuickSeam Walkway Pads as per Firestone specifications.

For a Ballasted System the QuickSeam Walkway Pads will be substituted by concrete pavers.

For concrete pavers: place a layer of protection mat or an additional layer of EPDM membrane underneath the pavers (min. 50 mm beyond the paver) to isolate them from the roofing membrane.

5Extensive Green Roof


In order to avoid mechanical damage during the installation of the green roof and/or during maintenance a protection layer must be installed on top of the EPDM membranes.

For the build-up of the green roof layers on top of the EPDM membrane we refer to the green roof designers and/or specialists.

Vegetations used for extensive green roofs are plants like sedums, herbs, prairie flowers, etc. A list of plants that must be avoided (plants that generate rhizomes) can be found on, but not limited to, www.fbb.de.

6Notes


The Firestone Building Products specifications will be strictly followed for all products supplied by the company. Prior to installation, Firestone Building Products must approve any deviation from the specifications. The works shall only be installed by an authorized contractor. A Firestone approved Contractor Certificate with validity date shall be provided before start of the works.

Installations must comply with all current relevant standards, codes of practice, and the Building Regulations.

A Firestone standard 10 years Membrane Warranty shall be issued to the building owner on completion.

All materials shall be stored clear of ground and moisture with weather protective covering. Keep all adhesives, sealants and primers away from sources of ignition.

Do not apply roofing membrane during inclement weather or when ambient conditions will not allow proper application.

At the end of the working day: Temporarily seal the membrane to the deck to prevent any water infiltration.

Temporary closures that ensure that moisture does not damage any completed section of the new roofing system are the responsibility of the roofing contractor. Completion of flashings, terminations and temporary closures shall be completed as required to provide a watertight condition. Ensure protection of warm deck insulation by temporary seal.

Ensure that the sequence of laying enables temporary sealing of loose membrane edges to be down the slope and not against the flow of water. On resumption of work cut away the tail of the membrane from completed area and remove from roof.

Safety scaffolding, rubbish skips, access ladders etc. should be agreed with the client and in accordance with the current Health and Safety regulations.

To avoid discussions because of any mechanical damage inflicted after the EPDM was installed, we strongly recommend testing the water tightness of the EPDM system immediately after installation and before the installation of the green roof.

Adequate temporary protection must be provided over the installed membrane during the works program, particularly at temporary walkways, access points to the roof, roofing material stockpiles etc. in order to prevent damage.

The main contractor shall ensure that all areas of the finished roofing system shall be protected from roofing related work traffic and other trades until completion of all works.

Firestone EPDM (acc. ASTM) Roofing System for Extensive Green Roofs v2017.01

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1 4Substrate Type: Concrete Concrete needs to be structurally sound and dry to the touch. Concrete should have aged for a minimum of 2 weeks before starting any roofing works. 2Reroofing iconA. This Section includes polished concrete finish in accordance with...

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