in these pictures i am attaching furfix to the wall so that we tie our new extension into the existing house. also i had to dicut a line down the wall on the existing house and side in a piece of 18 damp course instead of smashing out a full cavity to continue it from th extension to the existing building i then smeared compo at the side of the dpc to seal off any remaining gap stopping moisture getting thorugh. to attach the furfix to the wall i had drill hole into the wall put the furfix agaist the wall and hammer hammer fixing to attach it to the wall. then when i build the wall i will snap off the wall ties and slide them down to the apporiate height to tie the block work to the wall.