Block gap at base of plasterboard

BarraOG

I gutted an old bathroom upstairs in our dormer. I’ve now decided to wait with its renovation until I get the ceiling upstairs insulated to standard. Might be next year before this is possible. Would duct tape be effective at closing the gaps along the floor as seen in picture?

CFC052EB-0914-4F85-892C-5F95CDD47BD0.jpeg

MicktheMan

No, do it once and do it properly with good quality air tightness tape. Then when you get around to finishing the room, the airtightness work is already done.

colm_c

I would use some expanding foam to fill most of the void (if possible), then air tightness tape.

BarraOG

https://www.boards.ie/discussion/comment/119606169#Comment_119606169

Or maybe apply the tape first from within the room and then apply the foam from behind by entering crawl space?

Deagol

https://www.boards.ie/discussion/comment/119606169#Comment_119606169

I'd be extremely hesitant to use expanding foam. Was talking to a builder friend recently enough about using it for something similar and he said it's unknown the amount of small jobs he gets fixing damage to plasterboard walls from people using expanding foam. It has enough power apparently to push out the board and crack / bow the surface.

His advise was if you must use it, use much less than you think you'll need and add a little more if needed after the first squirt has set.

Lumen

https://www.boards.ie/discussion/comment/119608179#Comment_119608179

I think the low expansion foams applied with a high quality gun are fine, very controllable and not much "push".

Not sure if this is quite the product I used, but it was one marked with a load of certifications for air tightness and application to window fitting.

https://www.screwfix.ie/p/soudal-soudafoam-expanding-foam-gun-grade-750ml/5026d