It took almost all day for six blokes to ease the triple glazed sliding door unit through to the rear extension. Weighing in at a fraction under 700kg, it required care, patience and a degree in ingenuity. Missed the garage roof by an inch. Once off the mud, dolly came to the rescue, then it was a piece of cake, or sausage roll.
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There’s something rather satisfying about installing roof waterproofing. We’ve gone for Cure-It’s GRP fibreglass system for the extension and garage flat roofs; seamless, 20yr guarantee and it smells great. Now into winter Hardener season.
Applied direct to 18mm t+g OSB3 boards, with pre-formed perimeter trims. Trevor and team have worked hard to ensure the fall is sufficient to avoid ponding, but maintaining a level datum to the ‘parapet’, such as it is, as viewed from ground level. Upstand to main house has to set off 200mm from brickwork so external wall insulation can drop down behind. It's a tidy job. Rockwool have been on site to carry out pull-out tests for the external wall insulation board fixings. All passed. We're planning to use their REDArt system with 200mm and 100mm Dual Density mineral wool slabs.
There has been much discussion about the air-tight layer, which for this project, is at the outside face of the existing brickwork. The original plan for a sand and cement parge coat hasn't worked out as we can't find available tradesmen. Plan B is to rely on the adhesive that bonds the insulation boards until they're mechanically fixed. We'll stagger the two board layers and adhere the second one too, to reduce risk of air-leakage at the joints. This is new ground for Rockwool, and we won't know if it works until the air test in a few weeks. We are looking to use either EJOT's STR U 2G or Rawlplug's TFIX-8S screw in fixings, probably 355mm long for adequate embedment. Decisions, decisions. Are we the last to find out that PIR insulation is broadly not available at the moment (and probably not until early next year at best) due to a manufacturing incident in Germany. That's not good news for our programme or the specified Celotex FR5100 floor insulation planned throughout the ground floor.
Fortunately there’s still some phenolic around (albeit at a premium), so quick change of spec and now we’re waiting for a truck load of Kingspan K3 Floorboard. If there is a silver lining then the thermal conductivity for the K3 is slightly better (at 0.020W/mK), than Celotex’s 0.021. Tempted to go further and upgrade to Kingspan’s new K103 that replaces the K3, with an even better lambda value of 0.018 W/mK, but that improvement comes with a hefty price tag so we’ll stick with the K3, thanks very much. Get it while you can. |
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Russel and Anna Hayden
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