insulation in brick extension

[Min]

Hi folks

We are extending the kitchen out into the old single skin brick coal store and shed.

We had intended to line the brick with batons and Tri-iso 10 insulation, then plasterboard.

Now the demolition of the internal walls is complete we are re-thinking.
In terms of insulation effect, if we 'lined' the brick walls with a thermalite block wall, with almost no gap between the brick and block would this be enough?

We are not confident that it would provide a barrier to damp. Also will it be noticeable cooler than the Tri-iso option?

We are talking about two external brick walls. The party wall with the neighbour we're pretty sure will be fine with Thermalite.

Either way we are going to buy in trades to do the work: just not sure which way to go.

Thanks for your opinions/experience.

 

[jeds]

A thermalite block wall will not be sufficient (or advisable) on its own. You need to add a layer of insulation as well.

A cavity wall with 75mm full fill mineral wool batt would do it. Or a thermal plasterboard lining - Lafarge Thermalcheck K or similar - would also do. I personally wouldn't use bubble wrap stuck to kitchen foil but it's a choice thing.

 

[Min]

Hi John

"Bubble wrap pasted to foil" is your description of Tri-iso stuff??

Thanks


Min

 

[chessspy]

Hi, min,
there are a few options on this one, but all hinge on the D.S. or building regs passing it as kosher. (even if you are not obliged to get permissions, it will stand you in good if you ever want to sell, and advice from a pro on the spot is always good).
The party wall, if the other side is an unheated outhouse needs treating as an external.
You could use 3" thermals and a 1" cavity filled, but I'm not sure if that would meet the 'E' values required.
Or, 4"x"2 stud and filled with fiberglass and plasterboarded over that. (you might have to double board)
You should take steps to see there is a damp proof barrier, even if it means painting black stuff over all the walls you are going to cover.
chessspy

 

[Min]

Thanks for your replies John and Chessspy, v helpful