How To Join Old And New Concrete Roof Slab

2 to make sure that you dont have water thro them the best option is to have the new slab have a hood to cover the gap with the old one so that no water can come to the gap.

How to join old and new concrete roof slab.

Products like sakrete top n bondand sakrete flo coatalready contain polymers that greatly improve the bond of portland cement and should never be used with a liquid bonding agent. You dont want the old to get some stress due to the new slab and fail. The chemical approach involved mixing up a liquid bonding agent that helps bond new concrete products to old. Saturate the existing surface with water.

Simple flat roofs to sloped roofs concrete roof tiles offered various styles and colors to meet the architectural needs. If the patio butts against the house this is where an concrete isolation joint should be installed. Keep spraying it until the moisture runs off the sides instead of being absorbed. Concrete roofing all time material on 07 06 2012 17513 view s 2 comment s concrete is an all time material for roofing.

Enjoy the videos and music you love upload original content and share it all with friends family and the world on youtube. Make these holes 12 inches on center horizontally or vertically depending upon the predominant orientation of the joint. Drill 5 8 inch diameter holes six inches deep into the old concrete. Drill the exact depth specified in the general.

If the joint is wider than it is tall place the holes horizontally. Get the old concrete slab completely wet making sure any cleaning chemicals you used get rinsed off in the process. You can join the new concrete right to the old concrete this is called a concrete construction joint. Drill out the holes for your dowels using a hammerdrill.

1 i would not recommend that you join them as you would be unsure of the design of the old slab. Consult your project plans to determine the spacing of the rebar that was placed in the first slab and the spacing of the rebar that is to.