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

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


Neil,

Have a look at this link to see if it's any help:

http://www.azobuild.com/nhbc0404/6_1.pdf

You'll need Adobe Acrobat to look at it and the info that you want is around
page 8

Brian G

Thanks Brian I will have a look now.
"Brian G"  wrote in message 
news:3kq6dmFv9l3nU1@individual.net...

> 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
>
> Neil,
>
> Have a look at this link to see if it's any help:
>
> http://www.azobuild.com/nhbc0404/6_1.pdf
>
> You'll need Adobe Acrobat to look at it and the info that you want is 
> around
> page 8
>
> Brian G
>
>