Nick1c Posted May 9, 2020 Share Posted May 9, 2020 Our timber frame has a cantilever which requires fire protection. The architect specified 9mm Supalux & I paid no attention to this until I found out how much it costs! I thought I had found a suitable replacement in https://www.fireboards.co.uk/ (naively thinking the clue was in the title...) BC won’t accept it as it doesn’t have the correct certification. Can anyone suggest (certified) alternatives? Link to comment Share on other sites More sharing options...
scottishjohn Posted May 9, 2020 Share Posted May 9, 2020 cement board behindPB? or MGO board Link to comment Share on other sites More sharing options...
nod Posted May 9, 2020 Share Posted May 9, 2020 Why won’t he except Gypson fire board I’m always amazed how little fire protection there is on TF houses When do TF commercially we install fire break and fire baffles to every socket and light fitting Link to comment Share on other sites More sharing options...
scottishjohn Posted May 9, 2020 Share Posted May 9, 2020 can you check the gyproc "white book" and see if layers of staggered PB will give you the fire proof time you need we had to do this when i split my workshop into units 19mm plank ,then fireline board ,then another layer of fireline --all joints staggered. I canm,t see why MGO boards which if you check has an "A" rating won,t do -then cover in pb if not a hard plaster finish Link to comment Share on other sites More sharing options...
Nick1c Posted May 9, 2020 Author Share Posted May 9, 2020 (edited) This is for the following build up (bottom to top): Cedar, fire board, phenolic insulation board (£££!), CLT. Space is tight due to window heights, 9mm board was specified. I have just googled MO boards, it appears that their use invalidates a number of structural warranties so I imagine that BC wouldn’t be keen. Edited May 9, 2020 by Nick1c Link to comment Share on other sites More sharing options...
scottishjohn Posted May 9, 2020 Share Posted May 9, 2020 31 minutes ago, Nick1c said: This is for the following build up (bottom to top): I,m confused -- but bottom to top? ypu mean from outide to inside? you got drawings I can see no reason why MGO board would invalidate warranties when used as fire protection - Link to comment Share on other sites More sharing options...
Nick1c Posted May 9, 2020 Author Share Posted May 9, 2020 It is a horizontal external surface that needs protection - the underside of the cantilever, the structural element of which is 160mm of CLT. Link to comment Share on other sites More sharing options...
Mr Punter Posted May 9, 2020 Share Posted May 9, 2020 I have used Resistant Board. Much cheaper than Superlux. It has a fibre mesh reinforcing as well. It has all the certs. They are pretty helpful as well. https://www.resistant.co.uk/ Link to comment Share on other sites More sharing options...
Nick1c Posted May 9, 2020 Author Share Posted May 9, 2020 @Mr Punter, thank you, I have emailed them. The problem may be that I need the protection in a horizontal rather than vertical plane. Link to comment Share on other sites More sharing options...
Mr Punter Posted May 9, 2020 Share Posted May 9, 2020 I have used it for soffits on a timber frame. They have a test for a 90 minute ceiling with 2 layers. For external, 1 layer is probably enough as there will not be the same heat load. Ask them. Link to comment Share on other sites More sharing options...
Pete Posted May 9, 2020 Share Posted May 9, 2020 I have used resistant board on my cantilevered section of house and the vertical walls also Link to comment Share on other sites More sharing options...
Nick1c Posted May 11, 2020 Author Share Posted May 11, 2020 Resistant appear to be closed, does anyone know who stocks their 9mm fireboard? Thanks Link to comment Share on other sites More sharing options...
dpmiller Posted May 11, 2020 Share Posted May 11, 2020 just about every merchants over here... Link to comment Share on other sites More sharing options...
Nick1c Posted May 11, 2020 Author Share Posted May 11, 2020 I got through this afternoon - maybe they open after 8... Link to comment Share on other sites More sharing options...
Nick1c Posted June 6, 2020 Author Share Posted June 6, 2020 I had to go for the 12mm board as it is the one that is certified.... It weighs a ton! It also looks difficult to handle as I can imagine it snapping if not fully supported when lifting it flat. We are having the house boarded out next week & I will ask if they would also do this as presumably they will have board lifters & are used to doing it. I assume these are the type of fixings needed : https://timco.co.uk/217228-cement-board-screws-countersunk-wafer-ph-self-drilling-exterior-plus-grey we are near the sea, should I be looking for stainless versions? If I wind up doing this myself (with help) is it a good idea to cut the boards in half to make handling them easier? Tips from those experienced in using this board gratefully accepted. Link to comment Share on other sites More sharing options...
Nick1c Posted June 9, 2020 Author Share Posted June 9, 2020 (edited) Anyone familiar with fixing these boards? They will be covered with cedar cladding afterwards. Edited June 9, 2020 by Nick1c Link to comment Share on other sites More sharing options...
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