Underfloor insulation installation

[andygo]

A mate of mine had got some panels of fibreglass insulation. They are about 3" deep x,6'long x 2' 6" wide.

he has a kitchen with a tiled floor with underfloor electric heating between the tiles and the floorboards.

The plan is to install them under the floor, between the joists. Access will be from his cellar which has a low plaster and lath ceiling.

One idea is to remove poarts of the ceiling and slide the trimmed to suit panels between the joists. If that doesn't work then the idea is to remove all the ceiling (cosmetics not a huge issue) and attach the panels to the space inbetween the joists.

The bit that has us stumped at the moment is how to attach these rigid panels to the underneath of the floorboard. Don't really want to nail them in place as the underfloor heating elements might get damaged.

Any ideas folks?

[Dr_Rick]

Can they not be trimmed to be a tight fit so they're held there between the joists? Or you could get them to be an almost tight fit and then screw batons to the joists that stop the panels falling down (panels sit on batons).

Dr Rick

[Ganglandboss]

The normal way is by timber firrings nailed to the sides of the joist; the panels sit on top.

[Deva Link]

I saw it done once with something that looked like a wide version of the platic/nylon banding that goes around cardboard boxes. It was just strung from joist to joist and stapled into place.

[andygo]

I think the timber idea is going to be our best bet. Can't really see the insulation sliding easily between the floor and ceiling space.