Totally useless in British weather!
Don’t consider using their clayboard in anything other than perfect weather or under total weather proof cover.
Due to delivery delays (not related to Dufaylite) I was unable to use the product when it was delivered in August. By the time I could use it, the weather had turned and it hasn’t been dry enough to use it. Despite leaving the product in the plastic packaging it was delivered in, covering it further with pallet wrap and finally a tarpaulin, the product has still got wet and is now totally useless and must all be thrown away.
If you need an under slab heaveguard, do not be tempted to save a couple of quid using this product, get another one that doesn’t require the British weather to play ball. As far as I can see, this product has no benefits other than cost, and it just isn’t worth the trade off!


