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Critical Areas - Chimneys

Chimneys have basically one area that can cause problems for a cladding system: the chimney cap. If the chimney cap is done right, the chimney can be completely moisture free. But, when the chimney cap is done wrong, catastrophe could strike.

chimneycap-overview

On one chimney alone...

chimneycap-seam

there could be good things, like this seam of the chimney cap...

chimneycap-overlap

and there can be bad things, like the way this cap does not overlap the cladding.

As the top right picture illustrates, the seam on a cap is important. It diverts water from flowing into areas of the seam where cuts and bends were made. The picture of the chimney cap shows a folded seam that correctly diverts water away from creases in the cap.

The other picture (bottom right) illustrates the most common problem with chimneys: not overlapping the cladding. When a cap does not overlap the cladding, water may run directly off the cap into the cladding system. If the cap does not overlap the cladding enough, there is still a chance that the water can enter the cladding system.

Last modified on Thursday, 21 February 2013 00:50