Can you use Celotex for loft insulation?
Using rigid insulation board as loft insulation Some people may prefer to use rigid insulation board to insulate the loft space – for example Celotex or Kingspan – the process is pretty similar to above, although you will need less depth to achieve the same insulation levels (than mineral wool).
Is loft insulation less effective if compressed?
When you compress fiber glass batt insulation, the R-value per inch goes up, but the overall R-value goes down because you have less inches or thickness of insulation. So, you don’t get the full R-value on the label, but the insulation still works perfectly well if all you’ve done is compress it.
Do you need a gap between insulation and loft boards?
When you use solid insulation board to create a warm loft the key thing to remember is ventilation – you must keep a 50mm gap between the roof and the rigid insulation board. We would always recommend having a breathable membrane in place between the tiles and the rafters too to allow the roof to breathe.
Can you lay loft boards on top of insulation?
Placing loft boarding over insulation is an easy process and is essential if you want both storage and for your quilt insulation to work at its optimum performance. With the correct products, such as Loft Legs, this is easy and cost effective too.
Where does Celotex go?
Insulation boards by Celotex can be installed in pitched roofs, flat roofs, solid masonry walls and more.
What happens if you compress fiberglass insulation?
When you compress fiberglass insulation, you increase its R-value per inch, up to a point. However, when you compress a batt of a particular thickness, the total R-value does decrease.
How do I convert my loft to storage?
The simplest way of turning your loft into easily usable storage space is to lay boards over the joists and attach them with nails or screws. This will provide you with a stable floor that can spread the weight over the joists, as well as giving you easy access to your possessions.
Is it OK to insulate roof rafters?
Insulating between rafters will do no good, because the attic should be ventilated, and the rafter insulation would be between two unheated spaces. You can add insulation to the floor; the more the merrier. Moisture buildup in the attic is a concern because it can condense into water, often causing mold.
Does Celotex have foil on both sides?
Celotex has foil on both sides, what exactly have you bought? slight gaps along the edges.
How much insulation do you need for a loft?
It depends on the u value of the insulation. If quilt then it is generally 250mm minimum. If board then check with the manufacturer, via there tech email / helpline. Try or Google ‘loft legs’ which can suspend the boards on the existing joists giving a good air flow.
What is the minimum depth of Celotex I can use?
I intend to use celotex across the ceiling joists and then board on top. What is the minimum depth of celotex I can use to abide by the latest building regs? it should be 6″ (150mm) between joists. you can use plasterboard with 1″ polystyrene on back but it isn’t required.
How much insulation do you need between joists?
it should be 6″ (150mm) between joists. you can use plasterboard with 1″ polystyrene on back but it isn’t required. It depends on the u value of the insulation. If quilt then it is generally 250mm minimum.