Cutting XPS insulation?

[Alan Ambrose]

I have a bunch (~72m) of Ravatherm XPS blocks 100mm x 600mm x 1,250mm I need to make some cuts reasonably accurately at 30 degree angles. Something like below, if you're looking from the ends of the boards.

 

Anyone have a great method? The cut surface on the slope is 200mm long.

[JohnMo]

Good luck - can I ask why?

[Conor]

Handsaw.

[-rick-]

Can you make one cut and flip the cut-off over to be the second piece?

 

Not got practical experience but I've seen people make a wooden jig with a hot-wire.

 

If you need to also cut the length of the board to make a single angled cut work, could do this with another hot-wire jig or track/table saw.

[BotusBuild]

26 minutes ago, Conor said:

Handsaw.

+1, and a facemask

[SimonD]

56 minutes ago, Alan Ambrose said:

I have a bunch (~72m) of Ravatherm XPS blocks 100mm x 600mm x 1,250mm I need to make some cuts reasonably accurately at 30 degree angles. Something like below, if you're looking from the ends of the boards.

 

Anyone have a great method? The cut surface on the slope is 200mm long.

 

What do you mean by reasonably accurate? I've used my jigsaw with a blade with 150mm cutting length on both woodfibre and eps at similar angles to this.  With this you need to make a jig so you have a flat surface on with the rest to jigsaw as it won't make the angle if using the large flat area of ther xps. The other option is to make up a plywood jig that sandwiches the xps and gives you a cutting guide to rest something like the Bahco insulation saw on. I'd probably for for the second option.

 

But if money is no object:

 

https://www.festool.co.uk/products/cordless-products/cordless-insulating-material-saw/577231---isc-240-eb-basic-gb

 

https://produkte.mafell.de/en/sawing/insulation-saw/insulation-saw-dss-300-cc

[Beau]

I would make up a 30 degree wooden wedge and use that to guide a handsaw at the angle.