Loft insulation

[Walshie]

Hi,

I'm doing a major refurb and switching to an ASHP.

I've insulated the walls to within an inch of their lives but now just getting the new roof felt & battened.

I need to insulate the crawl spaces in the loft area and now is the time where I have the best access.

 

I have removed all the old fibreglass insulation and want to replace with something that is thermally efficient and won't cause me to itch as much as the fibre glass.

What would people recommend that is efficient and easy to install.

 

What depth of insulation should I be aiming for in the loft spaces?

 

Any help much appreciated.

 

Thanks,

W

 

[JohnMo]

37 minutes ago, Walshie said:

What would people recommend that is efficient and easy to install.

Fibre glass or other materials are much and such the same thermally. Some better than others.

 

You can get recycled plastic bottle insulation it's not itchy but a little more expensive. B&Q sell it, other places also.

 

Depth 300 to 400mm. But remember keep the eaves vent spaces free.

[Mike]

I'd choose a flexible woodfibre batt such as SteicoFlex (or hemp batts, but I AFAIK they're not yet widely available in the UK).

 

Apart from being pleasant to work with, they provides roughly double the 'decrement delay' compared to glassfibre or mineral wool (the length of time taken for heat to move through the insulation). That's very helpful in reducing indoor overheating in summer. Of course it also has good green credentials.