I have just been told by the building inspector that because the outside
wall of my sons single storey extension will become an inside wall, we need
to fit cavity trays above the tiles at lead flashing level. He suggests
cutting out the mortar joints for 4 bricks at lead flashing level and
putting a 9 inch DPC through to the inside blockwork, curling it up to make
a tray. On the slope he suggests staggering this. I understand the theory
of what he is saying but would appreciate any ideas on how to go about it.
How would you join the short length of DPC to make it on continuous piece?
We have not finished rafters yet so probably best to do the cavity trays
first?
Thanks for any input.
Neil

When I built such an extension nothing like this was suggested. Mind
you that was 15yrs ago.
However, there hasn't been a problem at all. More recently I had cavity
insulation installed.

On Wed, 27 Jul 2005 20:11:16 +0100, "Neil"
wrote:

I have just been told by the building inspector that because the outside
wall of my sons single storey extension will become an inside wall, we need
to fit cavity trays above the tiles at lead flashing level. He suggests
cutting out the mortar joints for 4 bricks at lead flashing level and
putting a 9 inch DPC through to the inside blockwork, curling it up to make
a tray. On the slope he suggests staggering this. I understand the theory
of what he is saying but would appreciate any ideas on how to go about it.
How would you join the short length of DPC to make it on continuous piece?
We have not finished rafters yet so probably best to do the cavity trays
first?
Thanks for any input.
Neil

Hi,

Maybe try feeding it in in one length as you go, doing 2 brick lengths
of cutting and filling at a time. If making a wider slot it will be
easier to cement it afterwards.

Wonder if it's possible to fold the DPC over at an angle so it can be
fed in more easily.

Failing that if doing short runs it should be possible to turn the end
of the DPC up a bit at the end of each run, by drilling through mortar
between bricks and breaking out to the slot below.

Try searching asking on a UK self build forum, must have been done
before.

cheers,
Pete.

Thanks Pete. I have managed to complete today. It wasn't as bad a job as I
thought. If any one else doing it suggest a 12 inch grinder, I tried with
my smaller grinder but ended up hiring a 12 inch, to cut thoroughly through
mortar joint.
Take care,
Neil
"Pete C" wrote in message
...
On Wed, 27 Jul 2005 20:11:16 +0100, "Neil"
wrote:

I have just been told by the building inspector that because the outside
wall of my sons single storey extension will become an inside wall, we
need
to fit cavity trays above the tiles at lead flashing level. He suggests
cutting out the mortar joints for 4 bricks at lead flashing level and
putting a 9 inch DPC through to the inside blockwork, curling it up to
make
a tray. On the slope he suggests staggering this. I understand the
theory
of what he is saying but would appreciate any ideas on how to go about it.
How would you join the short length of DPC to make it on continuous piece?
We have not finished rafters yet so probably best to do the cavity trays
first?
Thanks for any input.
Neil

Hi,

Maybe try feeding it in in one length as you go, doing 2 brick lengths
of cutting and filling at a time. If making a wider slot it will be
easier to cement it afterwards.

Wonder if it's possible to fold the DPC over at an angle so it can be
fed in more easily.

Failing that if doing short runs it should be possible to turn the end
of the DPC up a bit at the end of each run, by drilling through mortar
between bricks and breaking out to the slot below.

Try searching asking on a UK self build forum, must have been done
before.

cheers,
Pete.