dnb

Options for insulating beam and block floor

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I am considering options for floor insulation while I wait for deliveries for the roof. The plan is currently to use 150mm of PIR boards with 65mm of screed over the top. But this requires either paying over the odds at a local builders merchant or finding a way to get 20 cubic metres of PIR from somewhere like seconds and co moved across an expensive bit of water.

 

Are there viable alternatives to consider that achieve close to the same insulation values and end up costing a bit less or don't require me to drive a HGV to Wales?  Current best price is of the order of £33 per m2 to site.

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Posted (edited)

First google hit says they deliver to some parts of Wales and if I've done my sums right it's under £17 /sqm inc VAT. Free delivery over £400. Otherwise £40.

 

https://www.cutpriceinsulation.co.uk/collections/pir/products/quinn-therm-pir-insulation-1200-x-2400-x-150mm

 

Edit: Ah ok the Wales reference had me confused. I see you are on IOW.

Edited by Temp

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Posted (edited)
16 minutes ago, Temp said:

you are on IOW

Yes. That bit of water is an equal curse and blessing. I could live with 17 per m2... Even if I had to take a couple of vans to Southampton to tranship.

 

I was hopeful of some new process for applying insulation to floors that involved moving smaller volumes of stuff around the place. I guess that PIR still has the top spot though.

Edited by dnb

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I think only aerogel is better than PIR. That's very expensive and in it's best form its fragile.

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Phenolic is slightly better than PIR in terms of performance, Kingspan Kooltherm type stuff, 0.018U vs PIR at best at 0.021U. I also find it a much nicer product to work with.

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I just did mine in EPS had to use more for the same u value but price was miles better than that overpriced pir stuff. 

You would probably need 200mm ok if you have the height. 

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30 minutes ago, Russell griffiths said:

I just did mine in EPS had to use more for the same u value but price was miles better than that overpriced pir stuff. 

You would probably need 200mm ok if you have the height. 

300mm gets you to PH levels so I’m also an advocate of dig a little deeper and fill it up with EPS.

PIR is just so much more expensive to get a little thinner. 

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I think you can drive a Luton type van in a regular license. They are/were around 16cubic meters. Perhaps you can find a big enough van for one trip across the Solent. Van hire can be pretty cheap sometimes. 

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On 23/07/2020 at 21:50, Temp said:

Perhaps you can find a big enough van for one trip across the Solent

I am twisting the arm of a friend who has a horse lorry. It's bigger than a luton van, on a par with the 7.5 tonner, so has a chance of working, albeit doubling the already significant ferry fare. Problem usually is that the constraint isn't usually the volume  - I worked out that while a luton transit will hold 18.5 cubic metres, you can't get 18 cubic metres of PIR board in there because the length is less than 4.8 metres and both height and width are less than 2.4 metres so unless you break up the boards you end up with loads of wasted space.

The 7.5 tonner (assuming I found accurate dimensions) will take maximum 44 sheets of what I want, with a significant amount of unusable space.

 

Now need to find a 7.5 tonner I can hire over this side. Luckily I do have C1 class on my licence because I'm just old enough to not need a separate test.

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Take a saw and straight edge? If you mark both sides of any cuts you can put them back together for minimal gaps later.

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Posted (edited)

The other possibility would be to contact any removal companies. See if they have anyone moving off the island and offer them a load going the other way?

 

Actually this sounds like an idea for a small business. Must be lots of people crossing with empty or part empty Van's. Perhaps one already exists?

Edited by Temp

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4 hours ago, Temp said:

Actually this sounds like an idea for a small business.

It would be if the ferry companies played fair.

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How can they stop you carrying goods for someone else?

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Seconds and co are in Wales.  And there is another seconds PIR place next to Cardiff. They got brand new PIR that came out of the factory with minor faults,  but still more than suitable to bury in screed.

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Have you got a local cavity wall insulation contractor?

Can you do your design to use them?

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