way_lands4 Posted October 19 Share Posted October 19 Hi everyone, I have a flat roof that has started to sag and has recently started to leak on occasion. The problem area is about 1msq of deck, although I haven't lifted the felt yet. is it feasible to cut into the felt and do a large patch repair, replacing the board underneath and then just joining to the old felt? Or is this I'll advised? Link to comment Share on other sites More sharing options...
Conor Posted October 19 Share Posted October 19 Need to see photos of the full roof and details of construction to comment effectively. 2 Link to comment Share on other sites More sharing options...
joe90 Posted October 19 Share Posted October 19 You won’t really know till you strip the felt off and maybe the deck too. Link to comment Share on other sites More sharing options...
scottishjohn Posted October 19 Share Posted October 19 highly unlikly you.will get away with that if its sagging must be totally sodden and where is all that water going ,what damage to other fabric of roof and what about the rot on the joists below the board? or just use a gallon of roof repaur iiquid if it drys out enough put it off till spring? i am guessing it is a livable space below ? then any insulation will be wet as well guessing its av older house if its been done with felt ,so insulation is probably fibreglass wool which will hold water and spread it about maybe remove section of plastergoard from ihside to look ,as if its been wet it it need changing anyway you can do a rough patch inside once you have looked if it looks sound ,for the winter as said above pictures would be good Link to comment Share on other sites More sharing options...
Russell griffiths Posted October 20 Share Posted October 20 Disclaimer. This is a bodge up, but will get you a few years before you need to look at it again. Did the same job this weekend on a building that will be demolished in a couple of years. strip off 1400 x 1400 area back to the boards rip up the soft boards back to the joists cut a patch of new plywood or osb to fill the hole. cut felt and stick down to match height of existing roof, or higher.NOT LOWER. fill all gaps and joins with a roofing type sticky something clean an are far larger than patch 2mx2m cover entire area with a fibre reinforced coating. BOSTIK FLEXACRYL is what I used, very impressed but not cheap. 1 Link to comment Share on other sites More sharing options...
way_lands4 Posted October 20 Author Share Posted October 20 Thanks Russell! Is there any reason you didn't use torch down? My existing roof is bitumen and so I am aware that adhesives don't mix well. Link to comment Share on other sites More sharing options...
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