Any builders? Price for extension

[Guest cookiemonsterandmerlin]

Also make sure they dont use that pushshit piping behind the dabbing to conect to your rads .

ATB Cookie

[IanB 0]

you cant use celotex on a existing brick skin cause you have to build blockwork first,then celotex gets clipped to back of blocks with a air gap between celotex and brickwork,,,so its not do able,unless you timber stud and celotex between.

if you want to block up a internal skin you better check the footins are wide enough,you wont be allowed by bco to go off slab in normal circumstances.its usually 100m cavity batts then 100mm solar blocks and to 100mm under concrete or screed,so means breaking up garage floor in most cases .and to insulate roof is normally 100mm celo between rafters and 25mm over then plasterboard if its a single story garage

 

You can't use celotex with an existing wall ?

 

So you can't build up an inner leaf to an existing wall and use fish tail wall ties or helical remedial fixings with clips as your building it up and add celotex as you go along, others seem to think you can..

[Qbgrey 4,159]

you cant use celotex on a existing brick skin cause you have to build blockwork first,then celotex gets clipped to back of blocks with a air gap between celotex and brickwork,,,so its not do able,unless you timber stud and celotex between.

if you want to block up a internal skin you better check the footins are wide enough,you wont be allowed by bco to go off slab in normal circumstances.its usually 100m cavity batts then 100mm solar blocks and to 100mm under concrete or screed,so means breaking up garage floor in most cases .and to insulate roof is normally 100mm celo between rafters and 25mm over then plasterboard if its a single story garage

 

You can't use celotex with an existing wall ?

 

So you can't build up an inner leaf to an existing wall and use fish tail wall ties or helical remedial fixings with clips as your building it up and add celotex as you go along, others seem to think you can..

i never seen it ianhow you gonna get last sheet on to back of blocks assuming your not taking the roof off? .if your doing on a building notice then you have to talk to bco about what he wants .if it was my garage id lay plastic up existing wall and batten it out,to get the air gap,then screw that 80mm /100mm celo with plasterboard stuck to it thus saving you 100mm space if thats on 2 walls you save 200mm aprox

[IanB 0]

Could you not put the last section in prior to finishing off the internal leaf? Must be some way to do it.

[SEAN3513 7]

Could you not put the last section in prior to finishing off the internal leaf? Must be some way to do it.

 

Exactly , then build in front of it, surely ??

[rob84 112]

you cant use celotex on a existing brick skin cause you have to build blockwork first,then celotex gets clipped to back of blocks with a air gap between celotex and brickwork,,,so its not do able,unless you timber stud and celotex between.

if you want to block up a internal skin you better check the footins are wide enough,you wont be allowed by bco to go off slab in normal circumstances.its usually 100m cavity batts then 100mm solar blocks and to 100mm under concrete or screed,so means breaking up garage floor in most cases .and to insulate roof is normally 100mm celo between rafters and 25mm over then plasterboard if its a single story garage

 

You can't use celotex with an existing wall ?

 

So you can't build up an inner leaf to an existing wall and use fish tail wall ties or helical remedial fixings with clips as your building it up and add celotex as you go along, others seem to think you can..

 

you can use celotex with an existing wall job it was done on one of my jobs i went out to check on last week as you block up you drill in the wall ties to the outside block vertically every 450mm (two blocks). Before you block up internally you need to expose the footing to make sure that the toe of the foundation will pass the proposed block internally by 6"/ 150mm, your also looking for the foundation to be down to firm ground and at least 9"/ 225mm of concrete. with regards to the roof you have three options as far as i am aware.

1. flat ceiling 300mm of rockwool

2. minium 140mm of celotex between or below rafters

3 80mm celotex between the rafters with a multifoil quilt insulation below - make sure it is a product that has had BBA certification

 

not sure where all these boys are getting their ideas on 100mm celotex for the walls. A new house being built has normally only has 60mm celotex in the cavity so 100mm celotex for a garage conversion is a bit over the top!

[Qbgrey 4,159]

Could you not put the last section in prior to finishing off the internal leaf? Must be some way to do it.

yes it could be done but the celotex must be tight to back of blocks not pushed out into cavity by mortar.

[Qbgrey 4,159]

you cant stuff 300mm of rockwool into 150mm or even 200mm existing joists,even if existing joists are300mm you need air flow.thats why you put 100mm celo between then vent the soffits which on a garage the fascias are normally tight to brick work so you have to extend your fascia to create space for soffit vents.ball ache

[rob84 112]

300mm of rockwool would be for a flat ceiling, not between the rafters!

[rob84 112]

300mm of rockwool would be for a flat ceiling, not between the rafters!

 

flat ceiling i.e between and over the ceiling joist.

[Qbgrey 4,159]

300mm of rockwool would be for a flat ceiling, not between the rafters!

 

flat ceiling i.e between and over the ceiling joist.

only if its a pitched roof can you lay rockwall cause you got a large ares thats got airflow.on a flat roof felted garage rockwalls not allowed.

[Rabbithunter 456]

Ian B... Go & start your own topic... Anybody would think you owned the place

 

Thanks for all comments .

[IanB 0]

Ian B... Go & start your own topic... Anybody would think you owned the place

 

Thanks for all comments .

 

Sorry..