How do I scrape out and replace the cement along my house damp course, and what is the correct cement mixture.

Answer 1

you will damge the damp course the membrane lies across both the course

FOR WHAT IT IS WORTH,YOU DONT KNOW WHAT YOU ARE DOING AND YOU WILL PROBABLY CAUSE MORE DAMAGE THAN WHAT IS ALREADY THERE.
TO REPLACE THE DAMP COURSE IS NOT REALLY A DIY JOB UNLESS YOU ARE AT THE VERY LEAST SEMI SKILLED. YOU ARE GOING TO **** YOUR HOUSE UP GOOD STYLE

Answer 2

In a way, the above answers are correct about difficulty of cutting out, packing and jointing. The only bit I disagree on is the ratio in the mortar.

Below DPC I use 3:1. Above DPC I normally do 4:1 for garden walls and 5:1 for houses.

Answer 3

If you are repointing, use a 4inch angle grinder with a diamond blade to grind out the existing mortar. Mix a 3-1 sand-cement mix with guaged out waterproofer.
Repoint using a trowel and a jointer - push it in as far as you can and strike it off.
If you are replacing the DPC use 4inch Damp Proof Course.
You will need a pluggin chisel. Grind out as deep as you can then carefully and painfully chisel out the mortar but only do up to 3 bricks at a time. be careful not to cause too much vibration as you will dislodge the bricks.
when you are confident that it is perfectly clear push in the DPC and pack it with broken pieces of slate being careful not to push it in too far as it will bridge the cavity. when you have jammed the slate in cement it on the outside and stike it with a jointer.
Again use a 3-1 mix with waterproofer.
Have fun

Answer 4

3 sand one cement after digging out old pointing. You will not damage the damp course as that is a membrane behind the pointing.

Answer 5

3 parts building sand to 1 part of cement with an added waterproofer to each mix. you can grind the joint out or bolster it with a special raking bolster, you can form pointing, struck down so elements run off the joint.
check ground level not breaching dpc, dependant on age of house check if slate
dpc might have broken up, check if cavity wall ties are not breached with cement snots etc, check downpipes, gullies for breach, best of luck

Answer 6

this is not a job for an amateur and i cant see why you are even thinking about it ..if you have some loose mortar on the dpc just rake out the loose and leave the rest alone .you will do more harm than good ..re point the raked out area with 3 to 1

Answer 7

Probably do it with a shovel.......the mixture is 3 sand and gravel to 1 cement..........