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Currently in the process of removing the absolute mess of insulation in my loft.
Will be putting new insulation in with loft legs and boards for some storage. Current storage is a mess of various boards sitting on the joists.
The joists are 130mm x 50mm at 450mm centres. . When insulating should I put down 100mm in between joists then 170mm over the top, or 150mm with another 150mm over the top. Insulation rolls don't come in 130mm apparently.
You can cut insulation with an electric carving knife.(great for foam too.
But why spend £9.99 for one from Tesco when you can buy this...
You can get 30mm and 100mm glass wool.
I'd use 150+150, but only because you might get a discount for quantity 🙂
IANAInsulationist
I'd use 150mm. It's not going to be hard to squash it to 130mm, in fact you'd probably have to actively fluff it up to get it to 150 anyway.
The recommended depth is now 300-450mm. The more the better, it really does make a difference, at quite a small cost.
Just roll out 150mm first, then either 150 or 170 on top
As much as more is better, if you're using loft legs, remember to leave a decent air gap between the top of the insulation and the underside of the deck. Also make sure it's open to the eves at the end to allow air circulation.
Also, while more is better, the law of diminishing returns does apply.
Having just fitted a load of lap vents in our loft I can confirm what onzadog says, more insulation needs more ventilation.
The recommended depth is now 300-450mm. The more the better, it really does make a difference, at quite a small cost.
Good to know, I did wonder if the regs had changed, last looked at ours a few years ago.
OP which stilt things did you go for, assume there's more choice now than when I looked years ago?
Not got them yet, but liklely to go with loftstilts.co.uk.
Think I'm going to go with 2x150mm. This will give me 30-50mm air gap between insulation and the boards and I've got a couple of rolls to get me started.
Cheers for the input everyone.
BTW removing old insulation is not a nice job.
Not got them yet, but liklely to go with loftstilts.co.uk.
Have a read of trustpilot reviews before you do!
I used them, everything was fine in the end, but much slower delivery than expected, which caused me to look into their reputation a bit more. Pay by credit card and allow plenty of time.
Fit eaves ventilation trays and get the insulation over the top of the external wall. All needs to be laid neatly with no gaps. Really worth fitting an insulated air tight loft hatch and make sure any penetrations through the ceiling are sealed. Most houses have big holes around water pipes and soil stacks. Recessed down lights need well sealed covers especially if they are in bathrooms. Humid air getting in the loft space can make the insulation wet.
loftstilts.co.uk
These look exactly like B&Qs own brand Diall loft legs.
I used the B&Q ones (and their t&g chipboard packs) and they were just the job.
I used loft legs from Celtic Sustainables. If they are in stock delivery is quick/cheap if you're buying enough. Requires 4mm diameter screws, minimum 6 per leg.
It's a job for two drill/drivers though to avoid having to change bits every 5 minutes.
I used loft legs from Celtic Sustainables. If they are in stock delivery is quick/cheap if you’re buying enough. Requires 4mm diameter screws, minimum 6 per leg.
It’s a job for two drill/drivers though to avoid having to change bits every 5 minutes.
Same here, very pleased all round. I did the work in the new year and it made a massive difference in the house. Well worth the effort of emptying the loft
Ordered legs from loftstilts.co.uk on Sunday and they arrived at lunchtime today. Can't complain at that.
Cheers for advice folks, loft hatch is being insulated with pir and sealing all replaced around it. Unfortunately can't get insulation over external wall as there's a brick course from the wall plate (internal cavity wall) to the sarking.
3 full days of removing old insulation 🙁