Seals of Control Joints and Gaps in Floors, Walls & Partitions


It is important to be aware of some basic facts regarding the application of sealant within control joints before attempting any installation of such products.

There is considerably more to providing an effective seal at a joint than merely filling the “as constructed” gap with an impervious material. The function of the gap filler depends as much on the movement to be accommodated at the joint and on the shape of the joint as on the physical properties of the material placed within the joint. If short cuts are taken, performance more often than not will simply not match expectations.

The function of a joint is to connect adjacent components or elements of construction in such a way that the performance of the connecting joint is maintained. Therefore, the joint should preserve, across the gap between the adjoining components, the properties of the elements — such as thermal insulation, acoustic insulation, weather exclusion (if in an external location), resistance to fire etc — to a degree sufficient for the structure as a whole to function as intended.

In addition, the jointing method must allow for inherent inaccuracies between the elements, e.g. inaccuracies in the setting out process and positioning, for some dimensional adjustments during construction as well as tolerances within the components of the elements of construction themselves. Where necessary, some allowance for building movement should also be made.

Application & Technical Manual

Promat Asia Pacific Handbook