Cost-Effective Alternatives to Thermofloc

[Toucan]

Without wishing to raise the thorny discussion of vapour barrier or no vapour barrier, I am looking at installing a permeable membrane as used by roofers and others who know what they are doing. I on the other hand, do not. In my undecided and confused approach to all things and wishing to show no commitment to anything, it seems that something like Thermofloc is an acceptable way of sitting on the fence. Only trouble is it is so expensive. Are there suitable alternatives that cost less?

 

[CAB96]

It appears to be loose fill?

Even if fully stuffed in to all cavities, I would think it would settle after being driven about, and leave voids at the top?

 

[Toucan]

It appears to be loose fill?

Even if fully stuffed in to all cavities, I would think it would settle after being driven about, and leave voids at the top?

Thanks for the reply. It is in fact a variable membrane. I’ll edit my post to make it clear.

 

[Toucan]

Unable to edit but this links to it:

Thermofloc VSD Membrane - VCL | Airtight Membrane

Thermofloc VSD Membrane is a vapour control layer with Variable Surface Diffusion, offering superior airtightness and moisture control for your building.

www.buyinsulationonline.co.uk

 

[Landy Andy]

That product is certainly expensive. At 37.5m squared @ £113.41 +vat. £137

50m squared @ £69 +vat. £83

Easy-Trim 1m x 50m Vista 162gsm (Extra Heavy Duty) Breathable Roofing Membrane | Nationwide Supplies

High performance roofing membrane that is vapour permeable, water resistant and airtight. They allow vapour to escape from the inside whilst repelling rainwater…

plumb.build

Which is a product I’ve used or even cheaper

Strotex 95 1 x 50m 100gsm Breathable Roofing Membrane | Nationwide Supplies

The membrane is highly recommended for cost-effective construction applications, particularly in roofs featuring an open thermal insulation system. With its exceptional…

plumb.build

 

[CAB96]

So not a vapour barrier?

I'm afraid I don't know enough about converting vans to have an opinion.

 

[Toucan]

Thank you. That's helpful.

 

[Toucan]

That product is certainly expensive. At 37.5m squared @ £113.41 +vat. £137

50m squared @ £69 +vat. £83

Easy-Trim 1m x 50m Vista 162gsm (Extra Heavy Duty) Breathable Roofing Membrane | Nationwide Supplies

High performance roofing membrane that is vapour permeable, water resistant and airtight. They allow vapour to escape from the inside whilst repelling rainwater…

plumb.build

Which is a product I’ve used or even cheaper

Strotex 95 1 x 50m 100gsm Breathable Roofing Membrane | Nationwide Supplies

The membrane is highly recommended for cost-effective construction applications, particularly in roofs featuring an open thermal insulation system. With its exceptional…

plumb.build

Thanks. That's helpful.

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[dunnah01]

I use Cromar Vent3 Classic for most breathable needs. Cheap as chips off Amazon

https://www.amazon.co.uk/dp/B00G96Y2M6?tag=mhf04-21

 

[Toucan]

Thank you. A more affordable option definitely.

 

[Southdownswolf]

Im certainly no expert, but looking at the products mentioned, Thermofloc is a Vapour Control Layer for the inside layer, whilst the others are permeable layers for the outside layer.
You do not want a permeable layer as this will allow moisture through. The permeable products stop rain coming in, but allow vapour to go through. VCL stop the vapour coming through.

 

[Toucan]

Thanks for that. I've been going round in circles over this for ages. I'm tempted to become a Greg Virgo disciple and use thermowrap as a barrier but given my level of skill I think it unlikely that whatever I install would achieve its intended purpose.

 

[Southdownswolf]

Thermowrap is certainly a product that could be used as that is its intended use. The idea is to try to stop any vapour/condensation from reaching the insulation and bare metal. Therefore the material has to be non-permeable. So you wrap with Thermowrap or other equivalent and use aluminium tape to join the seams and holes where cables come thorough etc.