How should Celotex be installed?

Step one: Make sure studs and rails are flush – no projections. Services must be correctly installed. Step two: Install Celotex insulation tightly between studs, pushing it up to plywood sheathing. For improved thermal performance, place the unprinted foil surface face against the air cavity within the studwork.

Does Celotex need an air gap?

Batten gap between bottom of celotex and plaster board. if the airflow is correct you won’t need foil back plasterboard. sometimes you can getaway with less celotex it depends on how strict the building control officer is. Of course this will have a negative effect on your heat loss and heating bills.

Do you need an air gap for insulation?

Insulation with a moisture barrier means you don’t need to leave an air gap during installation. This can be achieved with several specialist products or with natural insulation, which is inherently moisture wicking.

How thick should rafter insulation be?

Common rafter depths range from 100mm to 200mm. This limits the maximum thickness of the insulation between the rafters to between 50mm and 175mm. This generally would not be a sufficient thickness to achieve the U-values required to meet Building Regulations and more insulation would need to be added.

Does Celotex hold water?

Celotex does not absorb water due to its closed-cell structure. This allows the thermal performance and reliability of the product to be retained over time.

How do you attach insulation board to a wall?

Apply a bead of construction adhesive to the part of the studs you will cover with the first sheet of insulation. Press the insulation sheet firmly in place, and hammer cap ring-shank nails into the studs at 6-inch intervals.

Does celotex stop damp?

The vapour barrier is key as it stops moisture in the warm air in the habitable areas getting through to the cold side of the insulation and condensing. The combination of foil faced celotex with taped joints and foil backed plasterboard should give a continuous vapour barrier.

Does foil backed insulation need an air gap?

Do you need a 25mm air gap under the membrane? Although this is often considered standard practice, it is not a requirement; the important thing is that the drape in the breather membrane (which allows any water getting through the tiles to channel down to the gutter) should not be pushed out.

How do you increase the depth of rafter insulation?

The first option is to install additional boards, on edge — right on top of the existing joists — using “cleats” on both sides to secure the upper boards. For example, if the existing joists are two-by-eights, which are 7.5 inches deep, you can add two-by-six boards, which are 5.5 inches deep.

Should I insulate between rafters?

Insulating between the joists of your loft will keep your house warmer, but make the roof space above colder. This means pipes and water tanks in the loft space could be more likely to freeze, so you will need to insulate them.

What kind of insulation do you use with celotex?

Celotex TB4000 insulation boards are very similar to GA4000 insulation boards, in that they are general purpose PIR boards that can be used in a number of different applications. TB4000 insulation boards from Celotex can be used in floors, solid walls, timber and steel frame constructions and more.

How big is a Celotex GA 4000 insulation board?

Celotex GA 4000 insulation wall boards are PIR boards, consisted of a rigid core and aluminium foil facings on both sides, made in standard 1200mm x 2400mm size and thicknesses from 50mm to 100mm.

What is the thickness of a Celotex Pir board?

The Celotex GA4000 range is a range of general purpose PIR boards with thicknesses ranging from 50mm to 100mm. GA4000 is an incredibly versatile insulation board and can be used in a variety of applications.

Can a Celotex floor board be installed on a beam?

Celotex GA 4000 floor boards can also be successfully installed onto beam and block floors, due to their high dimensional stability, easy installation and provided continuity with added wall insulation. The beam and block floor should be firstly covered with some damp proof membrane, if possible.