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Insulation Questions

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370 Insulation questions

What should i use to insulate between the rafters in my roof?

My attic has been converted into two bedrooms, I have a normal staircase leading up to it. I have 4 hatches around the side walls. Inside these hatches I have noticed,due to the wind and chills, that there is no insulation whatsoever on the underside of my roof tiles. What should I be using to insulte this and what are the legal requirements and regs. ie spacing for ventillation? Do i also need to board over whatever I use to insulate this area.Any help would be greatly appreciated as i have a roll of rockwool and was going to use this and hold it in with sheets of wood. Is this wrong?
i would like to add that the conversion was signed off and certificated but was done before myself and the previous owners lived there. It must be 15 years ago.
Once i've used kingspan or celotex does this then require boarding over or plasterboarding?

How do I improve my bedroom (over garage) floor temperature?

We have a bedroom above an unheated garage which leaves the floor cold, especially during the winter. The garage ceiling is plasterboard, and has had wood pulp insulation blown between the rafters. The bedroom floor is still cold, the overall temperature in the room is OK but about 3C cooler that elsewhere upstairs. Would putting thermal foil under the carpet and underlay be a cure? If not any ideas would be most welcome.

the best way to cure condensation in upstairs bedroom, no cavity walls so struggling with moisture and mould appearing on outside walls in winter

What basic steps should I take to help save energy in my home in time for winter?

What 5-10 key things can people do to help cut costs and save energy in the home? What tricks of the trade do you know that no-one else does?

**This question is posted on behalf of the MyBuilder team - some of the content (and the tradesman's name) may be published on The Good Web Guide**

How do you insulate sloping ceilings?

Our house has sloping ceilings to all the upstairs rooms. The horizontal ceiling accounts for around 40% of the total ceiling area and is insulated with glass fibre between the joists, accessed via the loft hatch.

However, this leaves a lot of uninsulated sloping ceilings with little room (around 5 inches) between the plasterboard and the roof tiles. The only access to these voids is by peering down at 45 degrees, once you are in the main loft space.

I must be losing a lot of heat via the sloping ceilings. How can I insulate these sloping spaces between the rafters whilst allowing for sufficient ventilation? I should mention that I'm not keen on insulating from inside the bedrooms. The ideal scenario is to find a way that allows me to insulate from above but still keeping ventilation to the roof space and avoiding condensation...

...and I don't want to do the work myself!


Fireboarding my garage ceiling

Just bought a property and the garage above which is a bedroom with ensuite does not have a "fireproof" ceiling.
I want to remedy to this as soon as possible of course. What is the best option to have the ceiling to fire safety standards and how much does this normally cost? (garage is about 5.5 meters long by 3.5 meters wide and there is 1 lamp in the middle of it)
PS: I know the ceiling is not to fire safety standards because it was pointed out in the survey we had conducted before buying the property

I have a 2 bed Victorian terrace; what is the best way to soundproof the walls, that doesn't take up too much space and isn't too expensive

The ceilings are 2.56m high with the walls approx 3m wide


Damp on bedroom ceiling

Damp on bedroom ceiling after loft insulation only on the curved area. How do I insulate the empty cavity. Do I need more ventilation on my roof. Do all roofs need ventilation or do some roofs breathe round the tiles. So I have been told.

celotex garage

whats the best way to celotex the internal garage(converting to bedroom)
build stud frame (3x2 treated) fix to floor and ceiling 25mm away from wall then celotex between and plasterboard


there is more then 1 way of doing this would just like to know which way other builders would do this.i have had 2 different building inspectors come out both with different ways to do it,so just though lets pick mybuilders brain

How to install Cellotex on vertical studs covering eaves

Hi all,

I had building control inspector in recently on refurb project of a Victorian terrace and he has told us we need to insulate the triangular eaves space in our two loft rooms. Both sides have vertical walls built with stud just below the main purlins. They are about 0.7m high on one side, 1.2m high the other (which has a dormer). He has requested 270mm quilt on top of the floor in this space, and 100mm PIR boards on the verticals, which is fine.

My question is for the PIR boards, should these be cut to match the spaces between the studs (which are 70mm thick so they will stick out the back a bit), or can they be mounted behind the studs in much bigger slabs, which would mean a lot less cutting?

If they are in the spaces between studs, are they tacked in place with nails and then the gaps filled with expanding foam?

Many Thanks

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