Building Regs - 25% of thermal element.

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FreeD

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So whats the score with the 25% rule...how does it apply. For example is it on a per room basis or does it apply to the whole wall.

For example is it ok for me to go into a property and remove the render off one external wall in one room internally and re render as i'm not removing more than 25% of the whole wall just the wall in the one room?

Or does the rule apply on a per room basis so if its one wall in one room the 25% rule applies to each individual area?

If you know what I mean!?
 
Aslong as 25% has not been removed of the lot it wont make any odds and why is the building inspector involved in the first place?
 
Hi mate
The 25% rule is external works. The key word is thermal coverage of a building roof , renders this is what I was told. So your front elevation has 20m2 so can do repairs to 5 m2 with out building control involved. Internal works just get on with it.
 
Lets say you have to repair a pebble dashing job you can hack up to 25% off and re dash with out coming under building regs. and that would mean 25% of the whole building front, back and sides. Spunky are you still getting a machine and which one.
 
I want one financially computer says nooooooooo but I'll have to try nag get over that one, talk to the lads on here and get a good idea in you're head of what you want to do they'll sort you out, I've done loads of thinking and would prefer something a bit portable I don't specialise in anything, mainly internally tbh but when I do 2 coat work outside I think of the what ifs ......plus it's a fun/different way to work and when the machines running sweet you can bang it on
 
I'd like a standard ritmo that pumps 7mm grain size and 50m and will do acrylics etc if you've got the money mate get a ritmo xl it's the closest thing to it I would
 
Hi mate
The 25% rule is external works. The key word is thermal coverage of a building roof , renders this is what I was told. So your front elevation has 20m2 so can do repairs to 5 m2 with out building control involved. Internal works just get on with it.
Its also internal there was a thread on it a way back, if your hacking off internally all your plaster the u values are effected straight away and because U values have gone up putting like for like on wont add up, so im lead to believe.
 
yeh didnt the guy have problems being allowed to put lime plaster back on a stone wall cos the bco reckons he had to insulate internally? or was that the bco's interpretation...
in all honesty, i thought it applied internally too... but it does make more sense being external only or it becomes a minefeild...
 
This is what building inspector said (its all to do with the external thermal fabric) what he really was saying is it's £180 in our pocket we need this as we are self funding and I do not want to be the next one through the door we have already laid 7 off.
 
Hi the real truth is that it applies internally - and applies to each exterior wall so if you hack off more than 25% of the plaster on one wall then it applies and only solution is 50mm kingspan or equivalant plus 12.5mm plasterboard skimmed - i used the plasterboard thats bonded to the insulation at a house gutt recently
 
I think the internal plasterwork of an exterior wall is on a wall to wall basis to be upgraded with Kooltherm but if there are are two exterior walls to the room it makes sense to at least advise and maybe collar the extra work
 
No it's only the outside or the inside to insulate not both it makes no sence to do both.
 
Hi the real truth is that it applies internally - and applies to each exterior wall so if you hack off more than 25% of the plaster on one wall then it applies and only solution is 50mm kingspan or equivalant plus 12.5mm plasterboard skimmed - i used the plasterboard thats bonded to the insulation at a house gutt recently

Yea im thinking along the same lines. I've emailed Kingspan with some queries.
 
Ok 2 things i've been thinking firstly you are supposed to return the insulation on the internal walls 400 - 1000mm depending on type of brick/blockwork...this looks sh*t because you are left with a 50mm plus step in the plasterwork on the internal walls...any workarounds?

Also most solid walls are prone to penetrating damp...so if its not evident at the time it may develop in future so do you fix battens to the wall and not worry about it or do you build a stud frame off the wall?
 
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