celotex thermal and rockwool

[thuynh7]

If a builder has stated that he would do the following:-

"All walls to be insulated with celotex thermal and sound insulation"

And he then uses only rockwool on all the internal walls (I think the ceiling has Celotex). Is that an issue or a sign he is cutting corners or giving me cheap substitutes?

 

[freddiemercurystwin]

You would not use Celotex on an internal wall.

You insulate external walls for heat and internal walls for sound for which Rockwool is more appropriate.

 

[thuynh7]

how do you class what is an internal and external wall, sorry for asking

 

[freddiemercurystwin]

Err OK, an external wall is one that is exposed to the outside. Any other kind of wall is internal.

 

[thuynh7]

sorry i had to ask to make sure, as he put rockwool on the sides of outbuilding, meaning the walls that form the sides of the outbuilding

 

[jeds]

It sounds like your builder is designing the building. Did you not give them a design to work to.