{"product_id":"fletcher-permatuff-building-blanket-medium-duty","title":"Fletcher Permatuff Building Blanket Medium Duty Metal Roof Insulation","description":"\u003cp\u003eFletcher Permatuff Building Blanket is a glasswool roofing blanket with a medium duty, puncture resistant polyweave reflective foil facing, made for commercial and residential metal roofs. These rolls are R1.3, 55 mm thick and 1200 mm wide. Fletcher say the foil aids in minimising the risk of condensation in metal roofs.\u003c\/p\u003e\n\u003ch3\u003eMedium duty for wider purlin spans\u003c\/h3\u003e\n\u003cp\u003eFletcher's AS\/NZS 4200.2 duty table calls for medium duty or higher on unsupported spans over 900 mm and up to 1200 mm, which is where Permatuff MD fits. Light duty covers spans up to 900 mm. Over 1200 mm, fit \u003ca href=\"\/products\/bradford-roof-safety-mesh\"\u003esafety mesh\u003c\/a\u003e or similar underneath.\u003c\/p\u003e\n\u003ch3\u003eWhat R1.3 means on the roof\u003c\/h3\u003e\n\u003cp\u003eR1.3 is the Material R-value of the blanket. The foil needs a still air cavity of at least 20 mm to perform thermally. Compression cuts performance, so Fletcher recommend \u003ca href=\"\/products\/roof-razor-insulation-spacer\"\u003eRoof Razor spacers\u003c\/a\u003e on the purlins where the roof allows.\u003c\/p\u003e\n\u003ch3\u003eFire limits\u003c\/h3\u003e\n\u003cp\u003eThe faced blanket cannot be classified to AS 1530.1 as an assembly, so it is not suitable where non-combustible material is required. It complies with AS 3959 for Bushfire Attack Levels Low to 40 under metal sheet roofs.\u003c\/p\u003e\n\u003ch3\u003eOrdering and site notes\u003c\/h3\u003e\n\u003cp\u003eA 15 m roll covers 18 m², a 20 m roll 24 m². Allow about 5% for waste on a simple roof. Lay it over the purlins or roof battens, foil down, rolling each run over the 150 mm lap. Keep the rolls dry, and take care with the conductive foil near wiring. Not for tiled roofs. Full figures are in the table below.\u003c\/p\u003e","brand":"Fletcher Insulation","offers":[{"title":"R1.3, 15 m x 1200 mm x 55 mm (18 m²)","offer_id":67636031422646,"sku":"4020322","price":126.0,"currency_code":"AUD","in_stock":true},{"title":"R1.3, 20 m x 1200 mm x 55 mm (24 m²)","offer_id":67636031455414,"sku":"4020323","price":168.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0732\/3995\/3590\/files\/Permatuff-Building-Blanket-0524-2400x2400-1.jpg?v=1791896230","url":"https:\/\/awbm.com.au\/products\/fletcher-permatuff-building-blanket-medium-duty","provider":"AWBM","version":"1.0","type":"link"}