On 07/10/2020 16:59, newshound wrote:
On 07/10/2020 16:51, Tricky Dicky wrote:
To cut the Celotex floor insulation into joist gap panels, I bought
some of these jigsaw blades which should be good for up to 100mm.

https://www.amazon.co.uk/Bosch-Profe.../dp/B000R5LTGC


Now the jigsaw is not one of my favourite tools so I have never owned
an expensive one due to the little use I make of it. What I am finding
is go slightly off line and the blade bends out and it is almost
impossible to get a perpendicular cut over 1.2m in 75mm Celotex. Some
of the reviews mentioned this and I was wondering if the problem is
down to the blade having no set therefore not cutting a proper kerf or
is it down to the jigsaw?

Richard


Once you put any sideways force on a jigsaw blade it will bend and you
won't get a square cut any more.

Cut by hand using a panel saw?
+1
When I did the loft with 75mm insulation I just used a fine bladed panel
saw - easy cutting and not a lot of dust, despite all the "specialist
"advice about using special saws or jigsaw blades.