Where any paint residues have been deposited on the surface of the product, we would recommend that any paints or stains are removed using white spirit or diluted methylated spirit.
We would recommend that the paint does not exceed 5 layers or 3.omm in overall thickness.
The fire performance of the seal will not be compromised by the painted area.
Depending upon the paint type being used, PVCu is notoriously difficult to paint due to the surface tension and gloss of the extrusion. We suggest testing the paint in a small discreet area, before application. It maybe possible to increase the adhesion of the paint by lightly abrading the surface with sandpaper, without impairing the outer casing of the seal.
Where the adhesive impaired by removal of the seal, we would recommend that the seal is replaced with a new component. However, in some cases it maybe possible to apply a thin film of a PVA to fasten the seal into place.
Where the door or frame exceeds the height of the seal, we would recommend that any joins are installed in the lower extremities of the doorset assembly.
Where a smoke seal is required, this will be governed by either the Approved Documents (Building Regulations) or required to satisfy, the fire safety strategy of the building, where this cannot be determining, we would recommend the installation of a smoke seal.
The traditional use of intumescent seals within fire doors has been a long and established practice. However, changes in door core constructions and testing methods, there is a bias towards increasing the intumescent element, to increase the margin of safety of fire doors generally.
This depends upon the door core construction and the availability of the primary test evidence available to support the door. We would recommend checking with the door core provider for the test evidence or supplier. As a minimum we would recommend the installation of a 15mm x 4 intumescent seal.
The primary test evidence will specify the standard configuration of the seals used in this configuration, including the seal position and type. Refer to guidance provided by the manufacturer.
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