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Refer to the general section 1233 REFERENCED DOCUMENTS.  The following documents are specifically referred to in this section:

Manufacturer’s and supplier’s documents relating to this part of the work:

Waterproofing Systems NZ Ltd Product Manual (2017 edition)

Standard detailed drawings

Substrate readiness check sheet – bituFLAME®
Quality Control check sheet – bituFLAME®

BRANZ Appraisal 404 - bituFLAME® Roof Membrane Systems

Supplier contact details

Provide a material manufacturer/supplier warranty:

• Provide this warranty on the suppliers standard form (if not available then use the standard form in the general section 1237WA WARRANTY AGREEMENT)
• Commence the warranty from the date of completion of application.

Refer to the general section 1237 WARRANTIES for additional requirements.

Provide an installer/applicator warranty:

• Provide this warranty on the installer's standard form. (if not available then use the standard form in the general section 1237WA WARRANTY AGREEMENT)
• Provide the completed substrate readiness check sheet
• Provide the completed Quality Control check sheets
• Provide a PS3 for the system installation to the main contractor
• Commence the warranty from the date of completion of application

Refer to the general section 1237 WARRANTIES for additional requirements.

Roofing work to be carried out by experienced and fully qualified applicators approved by Waterproofing Systems NZ Ltd to install the bituFLAME® membrane system, and who holds a Licensed Building Practitioner's licence for external membrane applications.

Substitutions are not permitted to any specified Waterproofing Systems NZ Ltd system, or associated components and products.

Convene a meeting between the applicator, contractor and all associated consultants to ensure all parties have reviewed the plans, detailed drawings and specification and that all parties fully understand the installation and know what is required for effective performance of the system.

Where a standard WPS detail does not exist, or if a standard detail cannot be applied, an approved alternative must be obtained from Waterproofing Systems NZ Ltd  before proceeding with the installation.

Accept responsibility for the weather-tight performance of the completed roofing system, including all penetrations through the roof and junctions with walls and parapets.

Maintain installation quality necessary to assure that work is performed in accordance with this specification and the qualifying requirements of Waterproofing Systems NZ Ltd.

Ensure that the applicator's substrate readiness check sheet and quality control sheets are available on site and are completed as the installation is in progress fully and faithfully completed for each installation area.

Accept responsibility for the water-tight performance of the completed bituFLAME® membrane system.  All penetrations to comply with NZBC E2/AS1, 8.5.9 Penetrations and Waterproofing Systems NZ Ltd product manual recommendations.

Dam up at the rainwater droppers, scuppers and sumps to a depth of 40mm and flood test for 24 hours.  Follow through with a full flood test and sprinkler test vertical areas of the roof such as upstands and parapets.  Make good any lack of water tightness when the surface is completely dry.

BituPRIME quick drying solvent based bituminous primer compatible with the waterproofing membrane and formulated to prepare the substrate for optimum application of the membrane.  Supplied in 20 litre pails.

BituPRIME quick drying water based bituminous primer compatible with the waterproofing membrane and formulated to prepare the substrate for optimum application of the membrane.  Supplied in 20 litre pails.

Liquid applied water based bituminous adhesive primer for smooth surfaces such as polyethylene, PVC, aluminium, metals and polystyrene substrates and for for areas of installation where a torch cannot be safely used or is being used in areas specified in Waterproofing Systems NZ Ltd specifications or when the membrane system is being installed using the cold-applied adhesive method.  Supplied in 10 litre pails.

BituFLAME® BS, Plura AD, an APP modified bitumen 2.5mm thick base sheet with glass fibre reinforcement with a peel off removable backing.  Supplied in 1m wide x 10m long rolls.

BituFLAME® BS, an APP modified bitumen 3.0mm thick base sheet with glass fibre reinforcement with PE film to both sides.  Supplied in 1m wide x 10m long rolls.

BituFLAME® BS, an APP modified bitumen 3.0mm thick base sheet with polyester fibre reinforcement with sand finish one side and PE film other side.  Supplied in 1m wide x 10m long rolls.

BituFLAME® CS, an AAP modified bitumen 4.0mm thick exposed waterproofing membrane cap sheet with polyester fibre reinforcement with a mineral chip finish.  Supplied in 1m wide x 10m long rolls.

BituFLAME® Tanking, an AAP modified bitumen 3.0mm thick exposed waterproofing membrane cap sheet with polyester fibre reinforcement with a sand finish.  Supplied in 1m wide x 10m long rolls.

BituFLAME® Plura , re-roof membrane, a 4mm thick APP modified low viscosity bitumen with polyester fibre reinforcement with a mineral chip finish.  Supplied in 1m wide x 8m long rolls.

bituFLAME® Sealant, a general pupose bituminous sealant compatible with bituFLAME® membrane systems.  Supplied in 280 mil cartridges

BituFLAME® extruded bitumen fillets for all internal angles.  Supplied in 25mm x 35mm x 25mm supplied in 1.1m lengths.

WPS C-Screed, a premium grade polymer enhanced cementitious compound designed for high performance screeding applications 2-100mm thick, where substrate falls are required on concrete substrates for the bituFLAME® application. Supplied in 20Kg bags.

Gripset DM is a premium grade cement based compound used in conjunction with Gripset 11Y Latex Waterproof additive as a repair mortar for substrates.

Crystal Glaze a clear specialist coating with anti-lichen, moss and UV resistant properties for additional membrane protection which will bind and retain the mineral chip finish.  Supplied in 10 litre pails.

A non-fibred aluminium paint used to protect bituFLAME® CS (sand finish) from effects of UV.  Supplied in 20 litre pails.

BituFLAME® one way roof vents sizes 75mm diameter x 200mm high.

Allproof Vinylrite ring clamp droppers with a PVC base, brass screw fixed ring clamp and leaf guard fitting.  Supplied in 80mm, 100mm and 150mm outlet sizes.

Aquaknight heavy duty ring clamp droppers with a PVC base, stainless steel ring clamp and stainless steel leaf guard.  Supplied in 50mm, 80mm and 100mm diameter outlet sizes.

Allproof Vinylrite ring clamp dropper overflows with a PVC base, brass ring clamp and brass overflow leaf guard combination.  Supplied in 80mm, 100mm and 150mm diameter outlet sizes.

Aquaknight heavy duty ring clamp overflow droppers with a PVC base, stainless steel ring clamp and stainless steel overflow leaf guard combination.  Supplied in 50mm, 80mm and 100mm diameter outlet sizes.

E2 compliant, type 316 Stainless steel or aluminium scuppers designed to be recessed into the concrete or plywood substrates flush.  Available in 200mm x 75mm x 400mm long.

Type 316 Stainless steel or aluminium scupper overflows designed to be recessed into concrete or plywood substrates flush with the substrate surface.  Available in 100mm x 100mm wide x 400mm long.

Allproof overflow sump with integral overflow and designed to be recessed into concrete or plywood substrate surfaces flush. The sumps come with a riser fitting for the overflow outlet.  Outlet sizes are 80mm, 100mm and 150mm diameter.

Aluminium 50mm x 50mm drip edge trim in supplied in 3m lengths.

Install all products in accordance with Waterproofing Systems NZ Ltd Product Manual (2014 edition).

Work and materials to Waterproofing Systems NZ Ltd product method statements and specifications.

Take delivery of rolls undamaged and include for site handling facilities where required.  Stack on end, off the ground on a level surface, out of sunlight and above 5°C and with accessories.  Do not allow rolls to become crushed.

If not detailed on the drawings, confirm the layout with the site project manager to suit site conditions, and Waterproofing Systems NZ Ltd specification.

Ensure that preliminary work, including formation of falls, flashing rebates, provision of battens and fillets and fixing of vents and outlets to levels, is complete and properly constructed to enable the system to work as intended.  Ensure bituFLAME® bitumen extruded bitumen fillets are installed sealing off all internal substrate junctions.  Ensure the substrate is smooth, clean and dry.  Identify areas of potential movement and plan for movement joints.

Ensure WPS Substrate Readiness Check Sheet has been completed and WPS Quality Control Check Sheets are on site and completed.

Confirm that the substrate complies with the NZBC E2/AS1 for the relevant substrates and Waterproofing Systems NZ Ltd documents, including fillets, sumps, outlets and projections, and ensure work of the required standard.  Ensure the fall complies with E2/AS1 including correct fall to rainwater outlets to avoid ponding,

• Lay roofs to a minimum fall of 1:30 (2°) to NZBC E2/AS1, 8.5.1 a.
• Lay decks to a minimum of 1:40 (1.5°) to NZBC E2/AS1, 8.5.1 b.
• Lay gutters to a minimum fall of 1:100 (0.57°) to NZBC E2/AS1, 8.5.1 c.

Ensure concrete substrate has been allowed to cure for at least 28 days and has a moisture content of less than 75% RH before commencing application.  Prepare surface, including vacuum cleaning and acid etching/diamond grinding as necessary to leave smooth, clean, dry and free of debris.  Make good any cracks  or defects with Gripset DM Mortar

Install WPS C-Screed in accordance with manufacturer's requirements to form required falls to concrete substrate prior to bituFLAME® application.

Plywood to be minimum 17mm thick square-edged sheets for roof membranes and 19mm for decks complying to AS/NZS 2269.0, minimum CD structural grade with the sanded C side upwards.  Treated H3 with waterborne CCA treatment and kiln dried after treatment.  Lay with staggered joints (brick bond) with all edges of the sheets fully supported.  Ensure sheets are rigid with flush joints with no surface defects or ponded areas.  Chamfer all external edges with a minimum radius of 5mm.  Fix with glue and 10 gauge x 50mm stainless steel countersunk head screws, with all sheets tight butted.  Fix at 150mm centres on edges and 200mm in the body of the sheets.  Plywood and the timber substructure to have a maximum moisture content of 20% when the membrane is installed.  Plywood must not be LOSP treated.

Refer to 4338LS LAMINEX NEW ZEALAND STRANDSARKING ROOFING SUBSTRATE for specification requirements and details.

Refer to relevant compressed fibrecement section for specification requirements and details.

Clean down existing roof membrane and remove all contamination and loose particles.  Check that existing membrane is still fully bonded before application, if not, use spot mechanical fixing at 300mm centres as required.  Check also that existing laps and water discharge outlets are intact and watertight, if not, make good before applying bituFLAME® Plura re-roofing system.

Before applying membrane carry out preparatory work as follows:

• On old pour-on bitumen systems with large cracks and volcanoes identified, repair them using bitu-screed mortar.
• On existing aluminium coated asphalt and modified bitumen membranes water blast the surface to remove loosely bonded parts of the mineral chip finishes, and remove loose chips with a leaf blower.  Refix any loose membrane with mechanical fixing at 300mm centres as required.

Where the membrane is to be turned down at an external corner, chamfer the corner to provide a minimum 5mm radius.

Install bituFLAME® extruded bitumen fillets to all internal upstands and ensure tight and neat fit.

Fit membrane flashings to all internal and external corners and upstands and to all penetrations to Waterproofing Systems NZ Ltd specifications.  Neatly mould membrane up all upstands and around all roof penetrations with a tight cove.

Unroll and neatly set out rolls starting at the lowest point of the roof and run perpendicular to the roof pitch.  Lay out membrane and allow to relax for 30 minutes prior to laying.  In cooler conditions allow additional time for the membrane to fully relax.

Do not lay membrane in wet or misty conditions or below 7°C.  Check that the substrate is dry at time of laying.  Concrete maximum moisture content 75% RH; plywood maximum moisture content 20%.

Install the selected bituFLAME® base sheet and cap sheets specified, install the  membrane system in accordance with the bituFLAME® Product Manual specification.

Prime all surfaces with appropriate primer in strict accordance with Waterproofing Systems NZ Ltd recommendations, ensuring good even coverage.  Substrates left primed for more than 3 days before membrane installation will need re-priming due to contamination.

Lay membrane using a gas blow torch applied heat bonding, allowing 100mm for all edge laps and 150mm for all end laps.  Where a torch-on gas flame heat cannot be applied use cold applied bituBOND® with a hot air gun for the application of heat to make the bond.  Lay in order from sumps, through gutters, valleys, eaves, verges, main roof and upstands to cover flashings.

Control heat to ensure the membrane is fully bonded during installation  to the substrate with all laps properly formed.  Ensure full bonding between the bituFLAME® base sheet and bituFLAME® cap sheet.  Do not over heat membrane.

Remove peel off backing film of the bituFLAME® Plura AD and apply directly onto the primer allowing 100mm side laps and 150mm end laps.  Apply membrane to Waterproofing Systems NZ Ltd installation specifications.  bituFLAME® Plura AD is thermo-activated when the cap sheet is fully torch welded in place.

Fully torch the rolls of bituFLAME® BS 3mm thick directly to the primed substrate allowing for 100mm side laps and 150mm end laps.

Set out the selected bituFLAME® cap sheets to ensure laps are off-set to the base sheet.  Fully torch to the base sheet to Waterproofing Systems NZ Ltd installation instructions, ensuring the cap sheet is fully bonded to the base sheet.  All side laps 100mm wide and end laps 150mm wide.  All laps fully welded and seamed off.

Fully torch the rolls of bituFLAME® Plura Re-Roof, 4mm thick directly onto prepared existing membrane roof allowing for 100mm side laps and 150mm end laps to to Waterproofing Systems NZ Ltd installation instructions.  All laps fully welded and seamed off.

Lay membrane in box gutters longitudinally with the membrane neatly dressed into the internal corners and through the base of the gutter.  Ensure ring clamp droppers, stainless steel scuppers or overflow sumps are all fitted recessed into the substrate flush with the finished surface.  Scuppers must be finished with a drip edge for the water discharge.

Pre-prime the drip edge angle with bituBOND® adhesive at the time of general priming.  Install the bituFLAME® base sheet dressing down the external edge forming good adhesion then dress down onto the drip edge angle with slightly less heat to prevent burning off the primer.  Firmly block on the top external corner and front vertical face of the down turn.  Repeat the same action when installing the bituFLAME® cap sheet and trim off flush with the bottom of the drip edge. This requires to be completed prior to external gutter installation.

Weld lap joints using gas blow torch applied heat, remove granules from any cut end sheet lap area to create bitumen to bitumen contact.  All laps, junction’s and penetrations  to be checked make good any defective lap welds.

Cut and carefully mould with slight heat and dress into and around the penetration.  Torch weld into place ensuring a water tight seal.  Refer to detailed drawings in the bituFLAME® product manual.

Install bituFLAME® one way roof vents for roof space/moisture venting, 1 for every 70m² and a minimum of 2 vents.  Dress the bituFLAME® membrane up the vent body terminating under the vent cap.  Make good any exposed bitumen with loose chip to protect the membrane from weathering elements.

Install the specified ring clamp dropper, ensure it is recessed flush or just below flush with the adjacent substrate.  Refer to SELECTIONS for ring clamp dropper type and size.

Install the specified ring clamp overflow dropper, ensure it is recessed flush or just below flush with the adjacent substrate.  Refer to SELECTIONS for ring clamp overflow dropper type and size.

Install the selected scupper, ensure it is recessed flush or just below flush with the adjacent substrate.  Refer to SELECTIONS for ring clamp overflow dropper type and size.

Install the selected scupper overflow, ensure it is recessed flush or just below flush with the substrate and is the specified size on the detailed drawings.  Refer to SELECTIONS for scupper overflow type.

Install Allproof overflow sump seated flush or just under flush with the substrate glued and counter sunk screwed into position.  Finish the bituFLAME® into the sump 50mm deep.

Install specified site specific expansion joints where marked up on the roof plan as specified to the design detail within the plans and detailed drawings for the project.

Apply WPS Crystal Glaze single coat system with brush or roller over bituFLAME® CS (mineral chip finish) or over bituFLAME® Plura Re-Roof (mineral chip finish) in accordance with manufacturers requirements ensuring that the coverage is achieved.

Apply WPS bitumous aluminium UV Coating over bituFLAME® Tanking cap sheet (sand finish)  where exposed to UV in.  Apply in accordance with manufacturer's requirements ensuring that the coverage is achieved.

Heavy foot traffic is not allowed on the membrane after laying.

Provide access boards for later operations and remove when no longer needed.

• Arrange for an inspection of the completed work.
• Provide the applicator's substrate readiness check sheets and quality control sheets to the main contractor and to Waterproofing Systems for the issuing of the materials warranty
• Co-ordinate with the main contractors for the protecting and maintaining of roofing membrane until completion of the contract works.

Make good any covering cut or deformed by later work.  Making good to take the form of inserting a new whole or part infill sheet to maintain the appearance of the covering as originally laid.

Refer to 1270 CONSTRUCTION for completion requirements and if required commissioning requirements.

Dam up at the rainwater droppers, scuppers and sumps to a depth of 40mm and flood test for 24 hours.  Follow through with a full flood test and sprinkler test vertical areas of the roof such as upstands and parapets.  Make good any lack of water tightness when the surface is completely dry.

On completion remove debris, unused materials and elements from the roof.  Use a leaf blower to corner the loose chip and remove leaving the roof in a clean and tidy condition.

Conduct a final inspection of the completed bituFLAME® membrane and leave work to the finished standard required.