Chris@huahin wrote:I'm planning to build a house and I would like to know if anyone has had any experience in using control joints in the walls of the house to reduce cracks that may appear In it. I will have a long straight wall on one side of the house and I would like to put a couple of control joints into it. I have never seen it done in any Thai house and I wonder if it would help to reduce cracking. I understand that good foundations and building on firm ground will help, but is there any reason why Thai houses don't use control joints?
As most current house are built with concrete posts infilled with concrete blocks (either AAC or concrete wetabix blocks) which is rendered with a cement based mixture the render expands and contracts at the same rate as the base structure there is no need for control joints.
All you need is to reinforce the junction between the posts and infill walls with stainless steel mesh to resist cracking at that point (due to wall movement not differential expansion) then you have crack free walls.
However if you want to add control joints, though unnecessarily, go ahead and enjoy the fun of trying to explain to your workers what you want and exactly how to make it
you will have to be on site all the time they are being installed as no Thai worker will understand how to make them and why you want them.
Take a look at any builds here and you will never see control joints and, after the render has dried, crack free walls. FWIW one of mine is 18 metres long.