I have now reached to point of laying 12mm plywood over the underfloor
heating grooved chipboard.

Any suggestions for suitable screw spacing?
--
Tim Lamb

replying to Tim Lamb, Iggy wrote:
For everything but tile, every 150mm at the board edges and every 300mm in the
board field. This will and should match the subfloor's screw spacing. For
tiled areas every 75mm at the board edges and every 150mm in the board field.

--
for full context, visit https://www.homeownershub.com/uk-diy...g-1250815-.htm

In message , Iggy
m writes
replying to Tim Lamb, Iggy wrote:
For everything but tile, every 150mm at the board edges and every 300mm in the
board field. This will and should match the subfloor's screw spacing. For
tiled areas every 75mm at the board edges and every 150mm in the board field.

OK Iggy. Now all I have to do is avoid the pipes:-(

--
Tim Lamb

On Sunday, November 19, 2017 at 8:47:15 AM UTC, Tim Lamb wrote:
In message , Iggy
m writes
replying to Tim Lamb, Iggy wrote:
For everything but tile, every 150mm at the board edges and every 300mm in the
board field. This will and should match the subfloor's screw spacing. For
tiled areas every 75mm at the board edges and every 150mm in the board field.

OK Iggy. Now all I have to do is avoid the pipes:-(

--
Tim Lamb

Many years ago now I went to a Murrayfield rugby match with a friend's wife while he replaced the wire nails the plumber had used with lost heads so that the floor could be polished. We returned some hours later to find his brother crouching on the floor with his fingers over as many holes as possible while the husband had gone off to find the plumber to turn off the water!!

On 18/11/2017 20:25, Tim Lamb wrote:
I have now reached to point of laying 12mm plywood over the underfloor
heating grooved chipboard.

Any suggestions for suitable screw spacing?

?None. Can you not glue the overlay onto the chipboard ?.

Why are the heating pipes in grooved chipboard ?. Don't
people normally use grooved insulation material with
metal spreaders to transfer the heat ?.

Is there a photo ?

In message , Andrew
writes
On 18/11/2017 20:25, Tim Lamb wrote:
I have now reached to point of laying 12mm plywood over the
underfloor heating grooved chipboard.
Any suggestions for suitable screw spacing?

?None. Can you not glue the overlay onto the chipboard ?.

No:-)

There is a 3mm foam underlay and the pipes have aluminium spreader
plates.

Why are the heating pipes in grooved chipboard ?. Don't
people normally use grooved insulation material with
metal spreaders to transfer the heat ?.

There are lots of ways to do this. I have to use an overboard set up
because the builders used random joist spacing.

Is there a photo ?

I'm taking shots as records.

--
Tim Lamb

In message , Rob
Graham writes
On Sunday, November 19, 2017 at 8:47:15 AM UTC, Tim Lamb wrote:
In message , Iggy
m writes
replying to Tim Lamb, Iggy wrote:
For everything but tile, every 150mm at the board edges and every
300mm in the
board field. This will and should match the subfloor's screw spacing. For
tiled areas every 75mm at the board edges and every 150mm in the
board field.

OK Iggy. Now all I have to do is avoid the pipes:-(

--
Tim Lamb

Many years ago now I went to a Murrayfield rugby match with a friend's
wife while he replaced the wire nails the plumber had used with lost
heads so that the floor could be polished. We returned some hours later
to find his brother crouching on the floor with his fingers over as
many holes as possible while the husband had gone off to find the
plumber to turn off the water!!

Ha ha:-(

No water in mine yet but I will test with compressed air.

--
Tim Lamb

On 18/11/2017 20:25, Tim Lamb wrote:
I have now reached to point of laying 12mm plywood over the underfloor
heating grooved chipboard.

Any suggestions for suitable screw spacing?

If everything is basically flat, then I find 12" is normally ok. If if
its a bit more wafty, then come down to a smaller grid.

--
Cheers,

John.

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In message , John
Rumm writes
On 18/11/2017 20:25, Tim Lamb wrote:
I have now reached to point of laying 12mm plywood over the underfloor
heating grooved chipboard.

Any suggestions for suitable screw spacing?

If everything is basically flat, then I find 12" is normally ok. If if
its a bit more wafty, then come down to a smaller grid.

I'm going with Iggy's 6" on the periphery but the pipe spacing is not a
convenient 12" so the rest tend to be a bit random. Very stressful
activity:-(

Full marks to Toolstation. 6 packs of screws ordered Sunday evening.
Arrived 8.30am! today.


--
Tim Lamb