TPO new house

Posted on by mike

Viking Enviroclad TPO (thermoplastic polyolefin manufactured by Carlile) to new house at Pekapeka north of Waikanae.
Chosen over Rubber on this project for the advantage of reduced seams, with wider and longer rolls, there are less seams on the finished roof.
Strong seams, the seams are heat welded to create a vulcanised, watertight finish.
High puncture resistance less chance of damage from following trades.
Elongation, forgives building movement which is to be expected in a multiple angled structure like this.
UV resistance and High solar reflectivity – Offers high solar reflectivity which can result in energy savings.

Substrate Inspection

Checking for;
Minimum required falls are met. E2/AS1 2011 states 2° for roofs (~ 1:30), 1.5° for decks (~1:40), 1:100 for internal gutters.
Plywood laid with the face grain at right angles to supports.
Plywood laid with staggered joints in a brick-bond pattern.
All plywood sheet edges to be fully supported by framing supports or solid blocking .
3mm expansion gap between plywood sheets at all edges.
Plywood to be screwed with 10g x 50mm SS counter sunk screws at 150mm centres on all sheet edges and at 200mm centres through the body of the sheet.
All screws counter sunk 1-2mm through the body of the sheet.
Plywood and framing supports to be at no more than 18% moisture content.
All drains and outlets are membrane compatible and fitted securely and flush with the plywood surface.

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main flat roof west side,internal multisloped gutter reverse view of previous image south section, gutter slopes 2 ways change of level in long gutter west wing narrow roof and gutter junction of main south roof and west roof south sectio looking towards west wing east corridor roof, slopes 2 ways short gutter in east corridor roof end of short gutter in east corridor roof from the back view to the south of east corridor roof moisture content is well within the 18% maximum for membrane laying

Surface Sealer hydroepoxy

Viking Surface Sealer, is a 2 pack waterbased Epoxy System, cured films are non-glossy and exhibit exceptional adhesion, chemical and water resistance. Used here to seal dry plywood prior to incoming rain before able to start the membrane installation.
Pot life once mixed 1½ – 2 hours. At 20°C touch dry 20 minutes – 1½ hours after which will not be effected by rain. 8-24 hours to full cure depending on ambient temperature.
Can also be used on damp substrates to seal and allow for membrane application without waiting days/weeks for plywood to dry.
however rain is forecast, so Viking Surface Sealer hydroepoxy is applied main West roof sealed with Viking Surface Sealer hydroepoxy reverese view of previous image west wing narrow roof and gutter sealed with Viking Surface Sealer hydroepoxy west wing narrow roof and gutter sealed with Viking Surface Sealer hydroepoxy east corridor roof, sealed with Viking Surface Sealer hydroepoxy

TPO Installation

start at South section internal gutter 2 pieces sloping with gutter horizontal (field) sheet glued up and tacking off one piece field sheet laid to south section roof long piece of TPO set in west narrow wing internal gutter 2 pieces sloping with gutter horizontal (field) sheet glued up and tacking off on west wing roof one piece field sheet laid to west west wing roof overhang lap is hotair welded welded down onto gutter sheets closer view along weld into gutter view along narrow ests wing to junction of 3 roof sections (completed) main west roof looking north, first gutter piece set in and glued up 2 pieces of gutter on west roof reverse view of previous image long 14.4m x wide 2.8m main sheet laid out and partly glued up reverse view of previous image one large sheet laid on west roof one large sheet laid on west roof later at the end of the day later at the end of the day close up of the gutter and outlets cut low view along gutter leve change, turndown lap welded closer view in gutter, turndown lap welded outlet and overflow trimmed and smudged with heat gun and roller level change intersection outlet and overflow at the level change outlet and overflow at the junction with the narrow west section outlet and overflow at north end of roof outlet and overflow at the west end of the south roof outlet and overflow at the east end of the south roof view across east corridor roof, short gutter section laid 2 full width sheets laid further down the roof reverse view of previous image large upstands added on low sun shines on nearly completed east corridor roof east corridor ready for rafter extension from higher roof view down the east corridor roof with extended rafter eave high end corners of east corridor gutter on the last day we had an explosion of robber flies on the roof area close up of robber flies that died on the roof