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I_R0M_I t1_ixrypwc wrote

I've seen it done with celotex type stuff. You can get special toggle things to hold it in place, or trays etc.

Also seen a more DIY approach of mesh netting stapled under joists, and rock wool type roll placed on the netting between joists.

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xenglandx t1_ixs6hna wrote

I was sure they banned it and came here to find out why

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hellcat_uk t1_ixshrmu wrote

Breathable membrane to prevent cold air wash over a fibre insulation that is flexible enough to ensure the gaps between the joists are filled.

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ZolotoGold t1_ixsihmd wrote

Be careful, you could end up with damp if you block up your cavities with insulation.

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jsm7464 t1_ixsilis wrote

The mesh is affordable and easy to install. Then just install batt insulation.

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uncle_escobar t1_ixsxm93 wrote

Hey I did this last year. I used celotex or whatever brand equivalent. I personally found it really easy to cut to size with a knife and then fit in between the joists. It seemed to have the best insulation rating.

I supported it with nails underneath knocked into the joists and then filled the gaps with insulation foam using a foam gun. The broad headed nails were cheaper than the custom supports or knocking in blocks of wood to support them.

Follow these best practices:

https://www.gov.uk/government/publications/insulating-suspended-timber-floors-best-practice

To prevent blocking anything and hopefully avoiding any damp problems in the future! They suggested quite deep insulation, i think i used 100 or 150mm but can't remember, whatever it suggested in that doc.

Hope that helps.

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