25mm Upstands concrete slab

[buildman]

Building drawings says 25mm upstand around all external walls.  So what about along  internal  block walls ? another grey area?

[Nickfromwales]

16 minutes ago, buildman said:

Building drawings says 25mm upstand around all external walls.  So what about along  internal  block walls ? another grey area?

Are these kickers on a block and beam?

[Canski]

do you mean perimeter insulation ?

[buildman]

 perimeter insulation on external  walls.  so what about internal block walls? they are on 100mm insulation so the concrete slab will be level with top of upstands / perimeter insulation 25mm

[Andehh]

We Insulated around internal walls as well, no harm in doing so and might help with thermal bridging a bit! Also more help for any settlement/expansion. 

[buildman]

No body knows the answer😂

[Nickfromwales]

25 minutes ago, buildman said:

No body knows the answer😂

I’m a bit lost as to how your internal block walls are on 100mm of insulation? That and busy as feck 😣

[buildman]

extension is several rooms with internal block walls built from footings.  plans say external walls with upstands.  so just the cavity walls  or internal block walls as well.  

[Temp]

Im going to say both. The perimeter insulation acts as a thermal break on outside walls and as an expansion gap/buffer on all walls. Without it if the slab expands there is a risk the wall can be pushed sideways. Not much but enough to crack mortar joints or the blocks.

 

 

 

 

[eandg]

You get 8mm perimeter strips for your internal walls. Blue foamy gear, cheap as online or four times as dear if you need to run to Screwfix the night before your screed pour like some idiots.