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

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?

newshound wrote in
o.uk:

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...-softmaterial-
Bl
ack/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?

A power tool is not the answer to every task.

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.

On Wed, 7 Oct 2020 16:59:42 +0100, newshound 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.

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

+1

Cut by hand using a panel saw?

+1

Or score and snap. Works at 25 mm not tried 75 mm that might be to
thick or require to much force over a too long a distance.

--
Cheers
Dave.

On Wednesday, October 7, 2020 at 9:03:35 PM UTC+1, Dave Liquorice wrote:
On Wed, 7 Oct 2020 16:59:42 +0100, newshound 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.

Once you put any sideways force on a jigsaw blade it will bend and you
won't get a square cut any more.
+1
Cut by hand using a panel saw?
+1

Or score and snap. Works at 25 mm not tried 75 mm that might be to
thick or require to much force over a too long a distance.

--
Cheers
Dave.

I used an old bread knife - works well.

The best are those with actual serrations, and a mix of serration pitches: f f f f m f f f f m f f f f m f f f f m f f f f m f f f f m f f f f m f f f f m IYSWIM

The more modern wavy edge ones are less good for this.

On Wed, 7 Oct 2020 13:09:16 -0700 (PDT), jkn wrote:

On Wednesday, October 7, 2020 at 9:03:35 PM UTC+1, Dave Liquorice wrote:
On Wed, 7 Oct 2020 16:59:42 +0100, newshound 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.

Once you put any sideways force on a jigsaw blade it will bend and you
won't get a square cut any more.
+1
Cut by hand using a panel saw?
+1

Or score and snap. Works at 25 mm not tried 75 mm that might be to
thick or require to much force over a too long a distance.

--
Cheers
Dave.

I used an old bread knife - works well.

The best are those with actual serrations, and a mix of serration pitches: f f f f m f f f f m f f f f m f f f f m f f f f m f f f f m f f f f m f f f f m IYSWIM

The more modern wavy edge ones are less good for this.

I've found that a Stanley floorboard saw is good for fine-ish work. My
backsaw was to limited for the cuts and the Stanley is finer and thin but
not much kerf.
--
Peter.
The gods will stay away
whilst religions hold sway

On 7 Oct 2020 at 21:09:16 BST, "jkn" wrote:

On Wednesday, October 7, 2020 at 9:03:35 PM UTC+1, Dave Liquorice wrote:
On Wed, 7 Oct 2020 16:59:42 +0100, newshound 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.

Once you put any sideways force on a jigsaw blade it will bend and you
won't get a square cut any more.
+1
Cut by hand using a panel saw?
+1

Or score and snap. Works at 25 mm not tried 75 mm that might be to
thick or require to much force over a too long a distance.

--
Cheers
Dave.

I used an old bread knife - works well.

+1 - I've just cut up a load of 50mm celotex for some between joists flooring,
takes seconds to do an accurate cut. I've found the best way is not to cut all
the way through - do it to about 90% then 'snap' the board and break the uncut
foil with the knife. Bit like cutting plasterboard.

--
Cheers, Rob

Hmm, I used to love my jigsaw attachment for my drill. As long as the guide
was well pressed to the surface you could cut some lovely shapes with it I
found. But oh the dust!

Brian

--
--
This newsgroup posting comes to you directly from...
The Sofa of Brian Gaff...

Blind user, so no pictures please
Note this Signature is meaningless.!
"newshound" wrote in message
o.uk...
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?

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


Isn't this the type of job for a big handsaw?

https://www.toolstation.com/bahco-in...handsaw/p97588

https://youtu.be/9pFz9sYsvmA?t=72

--
mailto : news {at} admac {dot} myzen {dot} co {dot} uk

On Wed, 07 Oct 2020 08:51:25 -0700, 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...-softmaterial-
Black/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

Chainsaw?

Our builder got fed up with constantly cutting Celotex one day and just
blasted through the sheets with a chain saw.

Quick and effective but it did look as thopugh it had been snowing.

Cheers


Dave R



--
AMD FX-6300 in GA-990X-Gaming SLI-CF running Windows 7 Pro x64

--
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus

On 07/10/2020 18:41, David wrote:

Chainsaw?

Our builder got fed up with constantly cutting Celotex one day and just
blasted through the sheets with a chain saw.

Quick and effective but it did look as thopugh it had been snowing.


This look quick, and less mess.

tape - Perfect Insulation with PIR Board
https://www.youtube.com/watch?v=Omk68Z-tE7U


--
Adrian C

On 10 Oct 2020 at 09:04:41 BST, "Adrian Caspersz" wrote:

On 07/10/2020 18:41, David wrote:

Chainsaw?

Our builder got fed up with constantly cutting Celotex one day and just
blasted through the sheets with a chain saw.

Quick and effective but it did look as thopugh it had been snowing.


This look quick, and less mess.

tape - Perfect Insulation with PIR Board
https://www.youtube.com/watch?v=Omk68Z-tE7U

Looks expensive and convoluted - I just use expanding foam if the fit isn't
perfect (which it rarely is in an old property), finishing with aluminium
tape. And cut with kitchen knife, as above.

Mind, I can see how all of that kit might be justified if doing it for a
living.

--
Cheers, Rob

On 10/10/2020 09:39, RJH wrote:
On 10 Oct 2020 at 09:04:41 BST, "Adrian Caspersz" wrote:

On 07/10/2020 18:41, David wrote:

Chainsaw?

Our builder got fed up with constantly cutting Celotex one day and just
blasted through the sheets with a chain saw.

Quick and effective but it did look as thopugh it had been snowing.


This look quick, and less mess.

tape - Perfect Insulation with PIR Board
https://www.youtube.com/watch?v=Omk68Z-tE7U

Looks expensive and convoluted - I just use expanding foam if the fit isn't
perfect (which it rarely is in an old property), finishing with aluminium
tape. And cut with kitchen knife, as above.

Mind, I can see how all of that kit might be justified if doing it for a
living.


Its another of those demonstration videos on youtube where it is made to
look easy because everything is square and uniform.

--
mailto : news {at} admac {dot} myzen {dot} co {dot} uk

On 10/10/2020 11:36, alan_m wrote:
On 10/10/2020 09:39, RJH wrote:
On 10 Oct 2020 at 09:04:41 BST, "Adrian Caspersz"
wrote:

On 07/10/2020 18:41, David wrote:

Â* Chainsaw?
Â* Our builder got fed up with constantly cutting CelotexÂ* one day
and just
Â* blasted through the sheets with a chain saw.
Â* Quick and effective but it did look as thopugh it had been snowing.

This look quick, and less mess.

Â*Â* tape - Perfect Insulation with PIR Board
Â*Â* https://www.youtube.com/watch?v=Omk68Z-tE7U

Looks expensive and convoluted - I just use expanding foam if the fit
isn't
perfect (which it rarely is in an old property), finishing with aluminium
tape. And cut with kitchen knife, as above.

Mind, I can see how all of that kit might be justified if doing it for a
living.


Its another of those demonstration videos on youtube where it is made to
look easy because everything is square and uniform.


If you watch earlier Robin Clevett videos on this build you'll see why
everything is square and uniform.

--
Reentrant

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

Try steering the jigsaw by rotating it slightly in the vertical axis and
always only applying force in the exact direction the blade is aligned
to. Don't apply any sideways force, which you might be doing instinctively.

Bill

On Thursday, 8 October 2020 19:35:24 UTC+1, williamwright 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

Try steering the jigsaw by rotating it slightly in the vertical axis and
always only applying force in the exact direction the blade is aligned
to. Don't apply any sideways force, which you might be doing instinctively.

Bill

Or do yourself a bigger favour & don't use a jigsaw.


NT

On 08/10/2020 20:15, wrote:
On Thursday, 8 October 2020 19:35:24 UTC+1, williamwright 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

Try steering the jigsaw by rotating it slightly in the vertical axis and
always only applying force in the exact direction the blade is aligned
to. Don't apply any sideways force, which you might be doing instinctively.

Bill

Or do yourself a bigger favour & don't use a jigsaw.


NT


I have used those bosch blades for cutting 70mm quinntherm
and they worked fine for me.

Another method is to turn the back edge of a hacksaw blade
into a sharp knife and make a handle for it. By pulling
through the 'celotex' at 45 degrees an accurate cut is
easy.

For 50mm celotex a stanley knife with a longer blade is
perfect for a clean cut.

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?





--
Adrian C

On Wednesday, 7 October 2020 at 16:51:28 UTC+1, 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

Well the answer to the OP is it was the jigsaw. Bought a decent Makita and tried a long cut on a length of the Celotex and the cut was true and straight and absolutely perpendicular. That is going to save a lot of grief doing some more floors and particularly when it comes to insulating my man cave.

Richard

In article ,
Tricky Dicky scribeth thus
On Wednesday, 7 October 2020 at 16:51:28 UTC+1, 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...-softmaterial-
Black/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



Well the answer to the OP is it was the jigsaw. Bought a decent Makita and tried
a long cut on a length of the Celotex and the cut was true and straight and
absolutely perpendicular. That is going to save a lot of grief doing some more
floors and particularly when it comes to insulating my man cave.

Richard

Bought a decent Makita around a 120 quid excellent tool

Like most of their i other gear....

--
Tony Sayer


Man is least himself when he talks in his own person.

Give him a keyboard, and he will reveal himself.