Has anyone insulated underfloor

newbiejim

newbiejim

newbiejim

Soldato
Joined
22 Jun 2004
Posts
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Location
South Scotland
Essentially I`m considering this but would like some information from real world experience.

I thik I`m asking if anyone has done this does it make a noticeabke difference?, inasmuch as does the room heat up noticeably quicker and take longer to cool down, markedly so?
 
I've only done 50% of my downstairs living space and it's made a massive difference. I'm keen to get the other 50% done in time for winter.
 
dLockers said:
I've only done 50% of my downstairs living space and it's made a massive difference. I'm keen to get the other 50% done in time for winter.
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Thanks for responding, I'm looking to do it to improve comfort rather than absolute cost, for example if I come home from work at 5 & it's very cold the living room won't get properly comfortable until about half nine.
I've watched the usual YouTube stuff on it & if doing it would probably use kingspan type rather than wool.
 
newbiejim said:
Thanks for responding, I'm looking to do it to improve comfort rather than absolute cost, for example if I come home from work at 5 & it's very cold the living room won't get properly comfortable until about half nine.
I've watched the usual YouTube stuff on it & if doing it would probably use kingspan type rather than wool.
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Recommendation would be to search FB marketplace. It was considerably cheaper for 100mm PIR than anywhere else.
 
What type of construction is your house?

I ended up buying fancy sheeps wool for pretty much all the ground floor (suspended timber) as from my understanding is the joists etc still require airflow to prevent rot. I'll admit it took me ages to do, whether it made things better is questionable because we removed the carpets in both receptions so it was probably an improvement but more of a trade off because we removed them.

Seems worthwhile. I only put 100mm down and tbh i should have went all out and fitted 200mm but ah well.

Cost was around £800 i think about 3-4 years ago. That covered about 70m2
It was very easy to work with but my underfloor crawl space is shocking, probably barely 2 foot at points. I didn't want to lift the flooring and cause damage to that so took the longer approach.

I would be tempted to insulate the ceiling's but as the house is mostly lath and plaster
.... I think not.
 
sja360 said:
What type of construction is your house?

I ended up buying fancy sheeps wool for pretty much all the ground floor (suspended timber) as from my understanding is the joists etc still require airflow to prevent rot. I'll admit it took me ages to do, whether it made things better is questionable because we removed the carpets in both receptions so it was probably an improvement but more of a trade off because we removed them.

Seems worthwhile. I only put 100mm down and tbh i should have went all out and fitted 200mm but ah well.

Cost was around £800 i think about 3-4 years ago. That covered about 70m2
It was very easy to work with but my underfloor crawl space is shocking, probably barely 2 foot at points. I didn't want to lift the flooring and cause damage to that so took the longer approach.

I would be tempted to insulate the ceiling's but as the house is mostly lath and plaster
.... I think not.
Click to expand...
Floor is on wooden joists with maybe two feet below, I have cavity walls but have heard too many scare stories to risk it tbh.Yes the airflow beneath floor needs to be maintained, all the YouTube tutorials underline that.
Circa 1955 build.
My living room is about 32 sq metres so quite a cost if using Kingspan. I was thinking lifting flooring best but it is indeed a big job.
 
Sounds like lifting flooring up then tbh then batten strip along to sit the pir boards on maybe ? As said sometimes on facebook you do get people selling excess sheets which is worthwhile.
 
sja360 said:
Sounds like lifting flooring up then tbh then batten strip along to sit the pir boards on maybe ? As said sometimes on facebook you do get people selling excess sheets which is worthwhile.
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Yes that's the method, tbh I'm baulking at it a bit lol .
 
It is hard work, especially if you want to relay the original boards. I bottled it on this room and ended up ordering 22mm chipboard. I stopped updating my thread and just posted in man jobs, but here are some pics:

C15flMK.jpeg.png

O1E4fgI.jpeg.png
 
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dLockers said:
It is hard work, especially if you want to relay the original boards. I bottled it on this room and ended up ordering 22mm chipboard. I stopped updating my thread and just posted in man jobs, but here are some pics:

C15flMK.jpeg.png

O1E4fgI.jpeg.png
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You've did a great job there , extra power outlets while ure at it I see too. I'd be hoping to relay original boards & seal all drafts etc , tbh rn I'm not sure I'll embark on it , those pics scare me lol.
 
newbiejim said:
You've did a great job there , extra power outlets while ure at it I see too. I'd be hoping to relay original boards & seal all drafts etc , tbh rn I'm not sure I'll embark on it , those pics scare me lol.
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I won't lie, it was properly miserable. Trying to leave those few boards/relaying the 1930s T&G was the final straw. Not least for the cost of screws (just do the maths on 1x 2.4m * 0.6m versus about 6 lengths of T&G lol). I need to do the other room soon and I will be twice as quick as you'd expect - but saving a day or two by just binning the T&G 1930s boards will be a number 1 principle.

It has made a massive difference tho...
 
. we were suspended wooden floor with airspace under neath.
We pulled up all our floorboards in the last place and stuck 10cm jablite in between the joists before relaying Oak boards.
looking at hive info when we were there the house really did retain the heat much better.
 
Who would you contact if you were to want to get this done and pay a suitable trade? We have a suspended timber floor and there is enough space under it for someone to crawl around so I'd like to get this done.
 
Peerzy said:
Who would you contact if you were to want to get this done and pay a suitable trade? We have a suspended timber floor and there is enough space under it for someone to crawl around so I'd like to get this done.
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I guess if not doing it yourself a joiner would be capable, pretty sure there there are companies who specialise in this type of thing though too.
 
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