Insulation between batons

[rreanor]

I have a small area of wall to insulate, it's not an external wall but is next to a conservatory which is unheated. The wall is 2 bricks no cavity.

I have a load of kingspan left which doesn't have plasterboard attached so I'm thinking of just batoning the wall over strips of DPM and then fitting the kingspan between the batons, then plasterboard over the whole section.

Will this work, or will the batons create thermal bridges?

 

[motorbiking]

Ditch the batons and use plasterboard foam for both the insulation and the plasterboard. Use a couple of screws with plugs, in the corners to hold it in place. Use standard foam to fill any gaps. No DPM needed. Tape, edge and skim the PB and job done.

 

[JohnD]

You don''t need battens.

 

[rreanor]

Ditch the batons and use plasterboard foam for both the insulation and the plasterboard. Use a couple of screws with plugs, in the corners to hold it in place. Use standard foam to fill any gaps. No DPM needed. Tape, edge and skim the PB and job done.

I didnt want to buy a huge sheet of PIR board as it's expensive, but i do have spare timber, kingspan (minus the plasterboard) and plasterboard. I basically want to know if using batons with insulation between will achieve the same thing as an entire sheet of PIR board.

 

[motorbiking]

No is the answer, but if you already have offcuts of PIR, you can still foam them on to the wall and fill with foam. I'd just be careful that it didn't leave gaps. Any gaps causes condensation which can pool into the floor or wall.

I'm assuming there is an external door between the conservatory? Otherwise this is likely to be a waste time.

 

[Notch7]

I didnt want to buy a huge sheet of PIR board as it's expensive, but i do have spare timber, kingspan (minus the plasterboard) and plasterboard. I basically want to know if using batons with insulation between will achieve the same thing as an entire sheet of PIR board.

Buy a roll of 75mm foil tape and stick the insulation off cuts together taping both sides.

that’s the most reliable way of making offcuts act as one piece.

obviously any gaps will lower the u value

 

[rreanor]

No is the answer, but if you already have offcuts of PIR, you can still foam them on to the wall and fill with foam. I'd just be careful that it didn't leave gaps. Any gaps causes condensation which can pool into the floor or wall.

I'm assuming there is an external door between the conservatory? Otherwise this is likely to be a waste time.

Why would it not achieve the same thing?

This wall used to have a doorway into the conservatory, but i decided to block it up as a) it seemed odd to have to go into the conservatory to get into it, and b) seemed pointless insulating the wall if there was an uninsulated doorway in it! The entrance into the room is now from the inner house side.

I had already stuck the insulation to the wall, but suddenly realised it was the wrong way round and i was about to attempt to glue plasterboard to the foam side which really wouldnt have worked. So it all came off.

 

[motorbiking]

Is your kingspan foil backed?

The reason it will be less efficient is because the conductivity is at least 4 times higher than the insulation. Its also much easier to get gaps which allow condensation.

 

[phatboy]

Buy a roll of 75mm foil tape and stick the insulation off cuts together taping both sides.

that’s the most reliable way of making offcuts act as one piece.

obviously any gaps will lower the u value

I lay mine down on the floor between 2 weighed down battens, and foamed the edge, then pressed the next bit against it. Did it until the few pieces were joined. Few hours later taped. Ensures no gaps at all.