HI All, Im currently looking into using the space above the garage but the joists are way to small to accept any loading. There are 5 joists @ 600mm centres spanning 5215mm and they are 72mm x 34mm thick, without taking them out which would mean dismantling the garage ceiling what options do i have for strenghening these? any advice appreciated. Thanks
Had similar job while ago and it is remembered as hellish one. I had to fit slate tiles, instead of felt and preserve water tight ceiling underneath, 6", instead of existing 4" and double up (instead of ~600), had to fit them in between. Length was only just allowing to swing them in to the right length cuts to fit between ridge board and wall plate, but needing "bowing" to be upward had been using levers and club hammers to fit them in. Basically needed to chuck them in in pairs and reposition after wards. Depending if you get inspected and many other variables as for "residential dwelling" strength, I'd recommend 4"X2" and doubling the amount to reduce almost absolete these days spacing of 600.
Garage (shed) converted in to domicile structure has different load- strength requirements IE old coal storage outer building reasonable roof had to go, converting in to the kitchen and has been inspected no lesser than 3 times by local inspector, including requirement for RSJ beam etc, however appearance from outside hadn't changed at all.
Just to clarify, I used different jobs as examples. As for loads - need to have calculations done, in accordance to the change of structure designation... Although I have a feeling it is one of the "diy conversions" so having roof the same, ceiling the same strengthening threefold should be sufficient
The current rafters run length ways 17 1/2 ft long (from garage door to back wall) which seems weird, im planning on putting about 300-400 kilos of stuff up there spread out of the 17ft x 8 ft space. im asking for advice as it seems odd the way ceiling rafters are because i presumed normally they would run accross the shortest span?
Thanks, its just gonna be for storage above the existing garage nothing else, its the length of the current rafters that's puzzling me @ 17 1/2 long they seem to be in the wrong way round surely they should have spanned the 8 ft width?
pic be handy yes does seem odd if spread poss be ok you,ll be the first to know put a pic on may be able to shed more light cheers
Makes sense, as formed truss roofs have different requirements and calculations This should give you the answers http://www.home-extension.co.uk/tech2.html