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Refer to the general section 1232 INTERPRETATION & DEFINITIONS for abbreviations and definitions used throughout the specification.

The following abbreviations apply specifically to this section:

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 (Oct 2018)

Standard detailed drawings

Substrate readiness check sheet – duroTUF TPO
Quality Control check sheet – duroTUF TPO

BRANZ Appraisal 950 - duroTUF TPO Waterproofing Membrane

Supplier contact details

Provide a materials warranty in the suppliers standard form.

• Provide this warranty on the manufacturer/supplier standard form.
• Commence the warranty from the date of completion of application.

Refer to the general section 1237 WARRANTIES for additional requirements.

Provide an applicators warranty for the system watertightness

• Provide this warranty on the installer's standard form.
• 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 duroTUF® TPO membrane system who hold a current 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.

Dam at the rainwater droppers, scuppers and sumps to 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.

Accept responsibility for the weather-tight performance of the completed roofing system, including all penetrations through the roof and junctions with walls and parapets.  All penetrations to comply with NZBC E2/AS1 and Waterproofing Systems NZ Ltd recommendations.

Maintain 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 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 duroTUF® TPO membrane system.  All penetrations to comply with NZBC E2/AS1, 8.5.9 Penetrations and Waterproofing Systems NZ Ltd product manual recommendations.

50/50 mixture of solvent and duroTUF® TPO adhesive.

Specially formulated duroTUF® TPO contact adhesive in 19 litre pails.

CRC TPO solvent formulated for the 50/50 duroTUF TPO primer system.

Single ply duroTUF® TPO 1.14mm and 1.5mm thick smooth back reinforced membrane.  Supplied in 3m or 3.65m wide x 30m long rolls which can be supplied in cut lengths.  Colours: light grey and white.

Single ply duroTUF® TPO 1.5mm thick fleece back reinforced membrane Supplied in 3m wide x 30m long rolls which can be supplied in cut lengths.  Colour: light grey.

WPS unreinforced duroTUF® TPO for use in obtuse angles and sharp corners, heat welded to duroTUF® TPO.  WPS un-reinforced duroTUF® TPO used for detailing around pipes and door thresholds.

WPS un-reinforced duroTUF® TPO internal and external corners and T joint covers, used for detailing internal / external and 3 way lap joints.

WPS duroTUF® TPO 40mm x 40mm x 1.5mm thick under-flashing for  using at concrete to timber or RAB board internal angles.

WPS un-reinforced duroTUF® TPO walkway designed to provide a non-slip safe roof top access to plant which needs regular servicing.  The roll edges are marked with safety lines for guidance to roof top plant.  Supplied in 762mm wide x 15m long rolls.  Colour: Grey and white.

WPS specially formulated TPO sealant for duroTUF® TPO cut edge finishes.

WPS MS40 specially formulated for duroTUF® TPO as a sealant for compression flashing.

DuroTUF® TPO membrane cleaner used for lap preparation and removing marks from the duroTUF® TPO surface.  Supplied in  2 litre and 19 litre cans.

PVC pressure sensitive, self adhesive 36mm wide bond breaker tape used as venting grid tape.

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 duroTUF® TPO application. Supplied in 20 kg bags.

Allproof Vinylrite ring clamp droppers with a PVC base, brass screw fixed ring clamp and leaf guard fitting.
Supplied in 65mm, 80mm and 100mm 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 sumps available in sizes 455mm x 310mm x 187mm deep and 470mm x 290mm x 80mm deep 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 75mm, 100mm and 150mm diameter.

DuroTUF® TPO roof vent with re-inforced duroTUF TPO apron material for fitting to the roof membrane.  The duroTUF TPO roof vent is thermo welded to the duroTUF TPO membrane.  Size 127mm diameter x 200mm high

DuroTUF TPO 200mm diameter vent with a metal powder coated square top cowl suitable for bathroom fan venting and similar situations through a TPO roof membrane.

DuroTUF® TPO moulded unreinforced cone shaped pipe boots, either 25-70mm diameter or 25-150mm diameter approx 200mm high cone.  Pipe boots are thermo welded to the duroTUF® membrane, sealed with WPS MS40 sealant at the pipe boot/pipe junction and mechanically clamped around the penetrating pipes.  Available in grey or white.

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

EpiTape®, 80mm wide, non-vulcanized butyl rubber tape.

Aluminium termination bar 30mm wide x 2mm thick with 8mm diameter pre-punched holes at 105mm centres providing good mechanical fixing options.  Supplied in 3m lengths.

Schluter 25, a fleece backed, 3mm thick polyethylene uncoupling underlayment for exterior tile work over duroTUF® TPO membrane system.

Specifically designed for ceramic tile and stone installations.  Schluter 25 serves as an uncoupling layer, slip layer and vapour management layer that accommodates moisture from beneath the tile surface.

Refer to 4831WS WPS tileJAK® Raft System.

Take delivery of Waterproofing Systems NZ Ltd duroTUF® TPO branded rolls, undamaged and allow for site handling facilities where required.  Store membranes and accessory materials under conditions that ensure no deterioration of damage.  Ensure all tapes and adhesives are within their expiry dates.  Note: Some of the duroTUF® TPO materials are Class 3 flammable goods.

Confirm layout as detailed on drawings.  If not detailed on the drawings, confirm the layout with the site project manager.  Ensure the layout is setout  from the lowest point in the roof (rainwater outlets) to suit site conditions, and Waterproofing Systems NZ Ltd specification.

Apply duroTUF® TPO membrane system in dry atmospheric conditions and only when the air or substrate temperature is 6ºC and above.

Check falls comply with the specification, internal angles are neatly formed, droppers, scuppers and sumps are rebated just below the substrate surface. Check expansion joints are shown on the roof plan.
Ensure WPS Substrate Readiness Check Sheet has been completed and WPS Quality Control Check Sheets are on site and completed.
Confirm duroTUF® TPO thickness and colour, as specified in SELECTIONS.

Confirm that the substrate complies with the NZBC E2/AS1 for the relevant substrates and Waterproofing Systems NZ Ltd documents, including proprietary sumps, outlets and projections, and ensure work is 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 the surface, including vacuum cleaning and acid etching as necessary to leave smooth, clean, dry and free of debris.  Install grid tapes in 600mm x 600mm grid for venting that lead to one-way vents or other suitable approved venting outlet. No mortar fillets are required.

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.  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.

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

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

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

Run out the duroTUF® TPO membrane and allow to relax for 20 minutes before laying.  Do not stretch sheets or tapes when laying.

Apply PVC bond breaker tape in grid at 600mm centres to concrete substrate for venting purposes to Waterproofing Systems NZ Ltd installation requirements.

Check substrate moisture content is below 20%, all vertical and horizontal sheet junctions are close butted with no gaps.  Sand plywood joints flush to provide a smooth butt joint with no lip edges.  Ensure the plywood surface condition is smooth and lightly sand the entire surface if required or if contaminated with any spills or dirt.

All rainwater outlet fittings are fitted recessed flush or just under flush with the plywood substrate.

Refer to 4338LS LAMINEX NEW ZEALAND STRANDSARKING ROOFING SUBSTRATE for sarking application.

Check the moisture content is below 20%.  Ensure the vertical and horizontal junctions are tightly butted together.  Sand all sheet joints flush to provide a smooth butt joint remove any lip edges. and lightly sand the entire surface if contaminated with any spills or dirt.

Refer to relevant compressed fibrecement section for installation requirements.  Check substrate moisture content is acceptable, all vertical and horizontal sheet junctions are close butted with no gaps.  Sand sheet joints flush to provide a smooth butt joint with no lip edges and lightly sand the entire surface if contaminated by any spills or dirt.

Install duroTUF® TPO neatly into internal gutters longitudinally with all thermo welded joints above the gutter line excluding those required when an internal gutter design has changes of direction.  Ensure the duroTUF® TPO is neatly and tightly dressed into all internal corners.

Fix aluminium drip edge angle to underside of substrate at external gutters ensure epiTAPE® is installed onto the aluminium external face of the drip edge.

Install duroTUF® TPO neatly down over substrate then onto the 50mm external surface of the aluminium drip edge angle at external gutters trimming off neatly along the bottom edge of the drip edge angle.

Neatly set out rolls starting at the lowest point of the roof and run perpendicular to the roof pitch.  Allow for 40mm side laps and end laps.  Pre-plan the work to keep the number of membrane laps to a minimum, Selection of the best width of TPO will assist at keeping number of membrane laps to a minimum.

DuroTUF® TPO rolls to be relaxed for 20 minutes prior to installation.

Mix duroTUF® TPO adhesive and duroTUF® TPO solvent 50/50 into a uniform consistency and apply to substrate at a rate of 5m²/litre.

Apply duroTUF® TPO adhesive to the substrate at a rate of 1.5m² per litre by brush or roller ensuring good even coverage and leave to tack dry before bonding the two surfaces together.

The duroTUF® TPO edges need to be a rolled edge seal or have cut edge sealer applied.

Use protective gloves, apply duroTUF® TPO Membrane Cleaner to slightly saturate a clean cloth, using the cloth clean areas where MS40 sealant will be applied, laps joints before welding and marks on the finished membrane system.

Form all laps at 40mm cover using the Leister heat welder carefully heat both matting surfaces at the back of the lap evenly at the same time whilst firmly rolling on top of the sheet with the hand roller.  Using the Leister heat welder make your final run by placing the nozzle between the sheets at the front lap area, heat both surfaces (to the point of melting the matting surfaces) and creating a bonded lap of 40mm.  Firmly roll the lap with a lap roller immediately and test the lap joint on completion with a lap probe.

Where specified, form a 10mm expansion gap, install a 10mm backer rod in the gap and apply WPS MS 40 sealant over the backer tooled off neatly leaving no sealant on the substrate.  Install a 100mm wide strip through the expansion joint centralised and spot tacked on one edge of the TPO edge to hold it in place for the roof membrane installation.  Form the expansion joint.  Lay membrane across joint but leave unbonded underneath duroTUF® TPO on both sides of the joint.

Use a TPO heat gun, with detailing tip, to form and finish upstands, downturns, penetrations, sumps and vents to conform to the duroTUF® TPO Product Manual and NZBC E2/AS1.  Use the TPO hot air gun to form and heat weld flashing patches to the exterior of the duroTUF® TPO membrane.

Check that adjoining walls and parapets are prepared ready for the installation of the duroTUF® TPO membrane.  Confirm that openings have been prepared ready for the installation of skylights and other penetrations through the roof.
Required work includes the following:

• duroTUF® TPO membrane installation neatly finished to all sides of openings and to all wall and parapet junctions.
• installation of duroTUF® TPO 40mmx 40mm under flashing at concrete to timber or RAB board internal angles.
• installation of flashings (those required to be installed prior to installation of penetrating elements and/or wall linings).
• install pre-made duroTUF® TPO  re-inforced external corners at  these junctions.
• install pre-made duroTUF® TPO re-inforced corners internal corner junctions if not pigs ear folded detail.
• inspect and lap probe test all pipe boots, vents and any other detailing after thermo welding.

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 duroTUF® TPO into the sump 50mm deep on an epiTAPE® and reinforce internal corners.

Install duroTUF® TPO vent for roof space/moisture venting 1 for every 70m² and a minimum of 2 vents.  Thermo weld to the duroTUF® TPO and test with a TPO lap probe.

Install duroTUF® TPO square top, thermo weld to the duroTUF® TPO and test with a TPO lap probe.

Install duroTUF® TPO pipe boot, thermo welding to the duroTUF® TPO membrane test welded jointing with a TPO lap probe.  Seal the pipe boot to the pipe penetration with WPS MS40 and fit an adjustable clamp tighten and tool off the sealant

Install expansion joints as specified and as shown on the roof plan.

Inspect and test lap joints on completion with lap probe ensuring the lap is fully bonded and watertight, check all scupper, ring clamp, pipe boot, vents, and all un-reinforced detailing.  Make good any defects.

Install Schluter 25 uncoupling system over duroTUF® TPO membrane system in accordance with Schluter 25 specification.  Schluter 25 must be installed by a pre-approved specialist applicator approved by Waterproofing Systems NZ Ltd.

Refer to 4831WS WPS tileJAK® Raft System for installation requirements.

Foot traffic is to be limited during and after laying.  Providing access boards for later operations and remove when no longer needed.  Protect and maintain roofing until completion of the contract works.

Install walkway rolls for direct fix to duroTUF® TPO where indicated on roofing plans.

• 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 protection and maintenance of roofing membrane until completion of the contract works.

Make good any damage by other trades by welding a duroTUF® TPO patch to the installed membrane neatly to maintain the appearance of the covering as originally laid.

Where a suspended trafficable system. tiles or timber raft, is installed over, ensure the duroTUF® TPO is be left clean and undamaged by the following trades.

Carry out routine trade cleaning of this part of the work including periodic removal all debris, unused materials and elements from the site.

Repair damaged or marked elements.  Replace damaged or marked elements where repair is not possible or will not be acceptable.  Leave work to the standard required for following procedures.