Hi All,

A little bit of promotion here but hopefully you wont mind given the nature of it.

CREW energy are a SW London community energy group.

We help improve energy efficiency and reduce carbon emissions in homes and buildings for various organisations and people within the area.

We are a ‘community’ based organisation as we are local residents helping local people but are also a not-for-profit Community Benefit Society meaning any money we make goes back into local projects.

We have lots of really exciting projects coming up this year including having just been awarded a large grant to carry out feasibility work in implementing larger scale renewable heat installations into blocks of flats and a civic centre.
This, in addition to our normal work of helping smaller community organisations and our work running Energy Cafes; where we provide free energy savings advice and support to local people.

We have a lot to do and are looking for more people to get involved and help us continue to deliver our work that so beneficial to our community and London.

We are looking for volunteers, and will also have some paid roles, depending on experience, where we need projects managers and people with experience in this field (or for those who would like to gain experience to enable a paid role)

We also seek trustee roles if you would like to be involved in this capacity.

Please get in touch if you have any interest, or know anyone who would, as we would love to have more people involved in or growing community organisation. Feel free to call Peter on 07985082031.

You can also find out more about us here: http://www.crewenergy.london/

Tony - just had a look at your Draughtbusters website. Very useful stuff there. Despite having done loads of IWI on the first floor in our dormer bungalow, on a windy day it is noticeably colder upstairs. I'm sure this is down to the wind tunnel effect where the cold air moves across the building between the joists and becomes "underfloor cooling" for the bedrooms and simultaneously "above-ceiling cooling" for the downstairs rooms. I have stuffed rolls of fibreglass insulation at the ends of the "tunnels" several years ago but maybe these are not sufficient? I remember reading somewhere on the GBF where the contributor had cut squares of Celotex (or similar) and foamed them in place.

Do you think this would improve my situation?

It looks like a pretty painstaking job, not one I would relish undertaking especially as I have boarded out all the spaces behind the dwarf walls and which would have to be taken up to get access! I was hoping the rolls of insulation would be sufficient!

A step up from where you are, but the link in this thread may provide some ideas: http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16443

Fwiw I did that job from the inside of the upstairs room, lifted a floorboard next to the dwarf wall to get access to under the iwi. Bit easier than crawling down the triangle.

Your fibreglass will definitely slow down the underfloor gale, even if it doesn't stop it completely. If there are structural noggins somewhere between the joists, they will block any though flow, unless some sparky has cut notches through them.

Like Tony said, first step is to see how much of a problem there is, the ceiling rose is a good plan. Or can you roll back the carpet, find or drill a hole through a floorboard into the void, stick in a thermometer? It should be roughly room temperature in there, otherwise there's too much draught blowing through.

Mostly I put in rectangles of ply, bedded onto wide beads silicone (we had mice who chewed through PIR/foam) with glass wool for insulation. There were cables and pipes which were awkward to seal round.

Sorry LEH this has gone way off topic. Good luck recruiting.

Phil/Tony/Will/Nick: many thanks for your replies. You all seem to be “singing from the same hymn-sheet” as they say. I suspected that the fibreglass roll idea was not the most brilliant, but it was a case of expediency at the time. With hindsight I should have taken the time to do the Celotex/ply/foam approach in the beginning when there was no boarding or stored “stuff” in the triangular space!

I’ll try monitoring the temperature in the void space next time we have a cold windy day. I know the triangular space behind the dwarf walls is very cold on such occasions as the wind comes through the vents in the soffits!

London Eco House - apologies for unintentionally hijacking your thread. Hopefully Tony will be able to provide you with some assistance. I live in west Wales so of no practical help to you.