chriz1 Posted October 2 Share Posted October 2 Plan to build a timber frame garage in a slab at side of my house slab is about 6 inch and has been down for a few decades no cracking. Be a shame to dig it up and lay a new foundation I'm limited in width anyway and has to be detached to avoid building regs, boundary wall one side and house the other 3m wide and length will be 6m I plan to lay 2 courses of engineering brick dpm and then timber frame sole plate on this. Question is can I build all this on the edge of the slab ? As I'd imagine all this timber frame, osb,battens and cladding will be a fair weight Link to comment Share on other sites More sharing options...
TommoUK Posted October 2 Share Posted October 2 You'll need a foundation. No point risking all the effort and cost to find out the slab breaks under the weight. 1 Link to comment Share on other sites More sharing options...
Conor Posted October 2 Share Posted October 2 Can't be timber if <1m from a boundary. Link to comment Share on other sites More sharing options...
TommoUK Posted October 2 Share Posted October 2 Maybe look at cedral or hardie plank if you want a timber look. But I'm pretty you'll still need fire rating on internal face too (2 layers of the pink).. Link to comment Share on other sites More sharing options...
kandgmitchell Posted October 2 Share Posted October 2 As has been explained in the other thread you have in Building Regulations a detached building has to be less than 15m2 if it is within 1m of the boundary and built of combustible material. At 18m2 you'll need it to be built of substantially non-combustible material to be classed as exempt from the Building Regulations. If not then you'll need to apply for consent. As to the capacity of the slab, it's hard enough when standing on it, looking at it to tell, nigh on impossible in a forum question I'm afraid. 1 Link to comment Share on other sites More sharing options...
chriz1 Posted October 2 Author Share Posted October 2 (edited) Detached garage but yes within 1m, it is so will be clad Cederal fibre board timber frame so will be excempt of building regs. Will be lined with fire plasterboard anyway as sensible for a garage. Just did some trail holes on edge of pad now 6.5 inch of concrete all around Edited October 2 by chriz1 Link to comment Share on other sites More sharing options...
kandgmitchell Posted October 2 Share Posted October 2 If it were me I'd do it but it's your choice. Remember if challenged you need to be confident that it's built substantially of non-combustible materials 1 Link to comment Share on other sites More sharing options...
chriz1 Posted October 2 Author Share Posted October 2 Yes I've checked with Bc and they are happy with what I'm proposing but it's doesn't need Regs anyway thats why I'm building it to be excempt. Link to comment Share on other sites More sharing options...
kandgmitchell Posted October 2 Share Posted October 2 Well if you've checked it's PD for planning and BC aren't interested then it's your call - I'd thought the existing slab would do the job for what is in effect a big timber shed. I've got a whole two storey house on 10 inches of concrete (ok plus some steel). 1 Link to comment Share on other sites More sharing options...
TommoUK Posted October 3 Share Posted October 3 17 hours ago, chriz1 said: Detached garage but yes within 1m, it is so will be clad Cederal fibre board timber frame so will be excempt of building regs. Will be lined with fire plasterboard anyway as sensible for a garage. Just did some trail holes on edge of pad now 6.5 inch of concrete all around I doubt any engineer would sign that off.. regs or not. Have a look at a standard spec for a detached garage slab. You'd probably need twice that thickness around the edge. Link to comment Share on other sites More sharing options...
joe90 Posted October 3 Share Posted October 3 5 minutes ago, TommoUK said: I doubt any engineer would sign that off.. regs or not. Have a look at a standard spec for a detached garage slab. You'd probably need twice that thickness around the edge. I disagree, my slab is about 6 - 7 inches with rebar for a log type timber garage and that was calculated by an SE. Link to comment Share on other sites More sharing options...
TommoUK Posted October 3 Share Posted October 3 42 minutes ago, joe90 said: I disagree, my slab is about 6 - 7 inches with rebar for a log type timber garage and that was calculated by an SE. How do we know there is re-bar in there? Link to comment Share on other sites More sharing options...
Iceverge Posted October 3 Share Posted October 3 What you could always do is if some trenches around the outside of the existing slab and make proper foundations there. Just use the slab as the internal floor. You'd know what you were dealing with then at least Link to comment Share on other sites More sharing options...
chriz1 Posted October 3 Author Share Posted October 3 Thanks guys, I could cut and lay a new foundation I guess. Unfortunately I can't lay next to the current slab as house is one side then retaining wall the other. I'm sure it will be fine I parked my works van on it for over 6 years and I think slabs been down as long as the house 1970s there no cracks at all. I may come in as much as I can get away with so its not right on the edge. Link to comment Share on other sites More sharing options...
Conor Posted October 4 Share Posted October 4 10 hours ago, chriz1 said: Thanks guys, I could cut and lay a new foundation I guess. Unfortunately I can't lay next to the current slab as house is one side then retaining wall the other. I'm sure it will be fine I parked my works van on it for over 6 years and I think slabs been down as long as the house 1970s there no cracks at all. I may come in as much as I can get away with so its not right on the edge. It'll do the job then. If any doubts, you could lay a layer of concrete on top with reinforcing mesh in it, tied in to the existing slab with dowels. Would be slightly higher but you'd have no doubts. 1 Link to comment Share on other sites More sharing options...
Benpointer Posted November 25 Share Posted November 25 On 04/10/2024 at 06:59, Conor said: It'll do the job then. If any doubts, you could lay a layer of concrete on top with reinforcing mesh in it, tied in to the existing slab with dowels. Would be slightly higher but you'd have no doubts. Reinforced concrete ring beam* on top of the slab in place of the 2 courses of brick sounds good to me. (But I am not an engineer.) (*Well, u-shaped beam as I assume you'll want to drive in without going over the bean on the door opening.) Link to comment Share on other sites More sharing options...
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