The Brew Cabin

Posted: **Thu Mar 13, 2008 12:24 am**

looking to see if anyone can help, ive got a job to do, building a small extension out of blockwork, i will be using a wall tie starter kit to tie the new blockwork to the old existing brickwork.

i was wondering on how to go about the damp proof course. do i lay my damp proof course at the correct height on my new blockwork and just expose the existing damp proof and overlap/join them or is there another way? and do i butt up the block work to the existing build and mortar the joint?
Cheers for any help,

Mark

Posted: **Thu Mar 13, 2008 7:36 am**

what BC make us do now mark is cut 100 mm into the existing damp (need a stihl or similar with a 13" blade to achieve this) then lap the dpcs 100mm
best to do this before any bwk is up as you need a bit of room to get the cutter horizontal
cheers LLL

Posted: **Thu Mar 13, 2008 8:53 pm**

Dont forget your verticle cut up the exsisting brickwork. this is also required to prevent damp migrating into what will become your interior wall.

Again just a cut with the sthil and insert a piece of DPM.

Posted: **Thu Mar 13, 2008 10:12 pm**

Mick Leek wrote:Dont forget your verticle cut up the exsisting brickwork. this is also required to prevent damp migrating into what will become your interior wall.

Again just a cut with the sthil and insert a piece of DPM.

we used to have to do this but they stopped us doing it mick,they reckon it weakens the wall??
weird
LLL

The Brew Cabin

Extension blockwork