AndyM Posted October 9, 2011 Report Share Posted October 9, 2011 I'm building a small extension with new walls on two sides... 2.50 x 3.00 http://imageshack.us/photo/my-images/69/sideelevation.jpg This plan is obviously not to scale.. I've been told by building regs I need to double the rafters around my two 800 x 1100 roof windows. At the moment we have installed 170mm x 50mm rafters with 250-300mm spacing across the roof... and with the span being being 2.50m. The window suppliers site seems to indicate they are happy with single rafters.. but has no clear info on installing to a new roof. Can anyone could point me to a place on the net for chapter and verse on this question ? Link to comment Share on other sites More sharing options...
AndyM Posted October 9, 2011 Author Report Share Posted October 9, 2011 http://imageshack.us/photo/my-images/849/rafterconfig.jpg/ This the current rafter configuration.. again not to scale. The total roof measures 3m approx from eaves to apex. Link to comment Share on other sites More sharing options...
wessex100 Posted October 10, 2011 Report Share Posted October 10, 2011 http://imageshack.us/photo/my-images/849/rafterconfig.jpg/ This the current rafter configuration.. again not to scale. The total roof measures 3m approx from eaves to apex.HiIf your building to satisfy the building inspector then you will certainly need to double up the rafters either side of the windows. You will simply need to cut four more and fit along side the first ones. Bolted is usually best.I would suggest you talk to the building control officer again to get his prefered method. Link to comment Share on other sites More sharing options...
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