yabaaaa Posted January 13, 2010 Share Posted January 13, 2010 Does anyone know how much heat transfer gets thru a concrete slab roof direct sun all day Assume 4 inch thick slab? or would it be better to use some q con aerated concrete panels and then pour a slab on top of them? I cant decide when I build whether to have a slab roof or a normal tiled, steel truss roof, the steel truss rather limits the design although I see in Madeira they build a slab roof and then just bolt onto that a pitched roof tiles and all just for physical appearance. Or how about a slab roof similar to above with a stee framed and tilel roof just raised a few inches off the slab allowing air under to remove excess heat keeping the slab cooler. Or am I nuts? hahaah Link to comment Share on other sites More sharing options...
trogers Posted January 13, 2010 Share Posted January 13, 2010 A concrete flat slab roof is expensive and difficult to keep water tight. It is used mainly for architectural reason, like on top of a high-rise, or for some, as an extended floor space. Heat insulation is not a problem. Most simple method is to use solar slab panels, which is 30x30cm pre-cast concrete panels with 5cm legs on each corner. The air pocket under the panel provides the insulation. A second layer of insulation will be the space above false ceiling below the roof slab. Using Q-block is inferior due to heat retention of the block mass. But in either cases, make sure you first get the roof slab water tight, and properly drained. Link to comment Share on other sites More sharing options...
yabaaaa Posted January 13, 2010 Author Share Posted January 13, 2010 Thanks tRogers I do have concerns over water penetration ie cracking and membranes etc long term durability. Link to comment Share on other sites More sharing options...
trogers Posted January 13, 2010 Share Posted January 13, 2010 Here is a pic of the solar slab. Link to comment Share on other sites More sharing options...
trogers Posted January 13, 2010 Share Posted January 13, 2010 Thanks tRogers I do have concerns over water penetration ie cracking and membranes etc long term durability. I do not like membranes. If it fails, the whole thing has to be removed. I prefer direct treatment of surface. Where it leaks is where it fails and we can repair it directly from the underside of the roof slab. I use Radcon for my condo projects: http://www.radcrete.com.au/productDetail.a...=1&c=133826 You can contact K. Sutisa 081-268-5044 Link to comment Share on other sites More sharing options...
yabaaaa Posted January 14, 2010 Author Share Posted January 14, 2010 Thanks tRogers I do have concerns over water penetration ie cracking and membranes etc long term durability. I do not like membranes. If it fails, the whole thing has to be removed. I prefer direct treatment of surface. Where it leaks is where it fails and we can repair it directly from the underside of the roof slab. I use Radcon for my condo projects: http://www.radcrete.com.au/productDetail.a...=1&c=133826 You can contact K. Sutisa 081-268-5044 Thanking you. Link to comment Share on other sites More sharing options...
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