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Leaking Curtain Walling Repairs & Proper Cleaning

Common Problems:
Poor fitting this is one of the most common problems with roof and curtain wall related leaks. When I suggest poor fitted this can stem from the original manufactures and fabrication quality control procedures or a lack of adequate training. Contractors also play a major part in the chain of events with poor fitting procedures.

Leaking and whistling curtain walling, again this was down to poor manufacture and fitting, water ingress into office were electrical equipment was close to hand (a potential hazard) this problem had been pointed out previously and again remedial action was taken by means of sealant.

On close examination we discovered that gasket between gazing and pressure plate was poorly fitted and in extreme cases missing, in the corners the gasket should be fitted together with chevrons and adhesive (in almost all cases this was missing).

How to solve the problem was simple we removed pressure plates, supplied and fitted new gasket and refitted pressure plates, cleaned off all sealant and checked internal drainage, it is important to note that curtain walling will have a built in drainage system to allow any ingress or condensation to drain through if as in this case the drainage channel is filled with sealant the cannel will overfill and enter the building.

Below is a very good example of the kind of problems that we encounter when called to investigate and repair leaking curtain walling. Faults are very often down to improper installation and/or a fault in the manufacturing process.

Background Information
Conditions prior to investigations. 2 x damp patches, evidenced by stained plasterboard Internal moisture readings prior to testing indicated areas as dry, with readings of approximately 40-45. (0-dry 100 saturated) Weather conditions: Dry
Simulated Rainfall Test 1
Test type Clear water. Item Joints between ridge horizontal and vertical glazing bars at four locations. Findings Water manifested directly below the ridge then migrated down internal frame. Similar results at all locations. Identified by Photographs above, items circled blue. Water entry points and direction of migration arrowed, also blue. Note: Gaps were in evidence at the glazing bar joints tested. Drainage channels from glazing bar covers had been blocked with mastc (e.g. circled red above)
Simulated Rainfall Test 2
Test type Clear water. Item Junction between static and sliding rooflight sections. Findings Water manifested directly below. Identified by Photographs above. Note: Missing cover flashing.
Simulated Rainfall Test 3
Test type Clear water. Item Junction between static and sliding rooflight sections. Findings Water manifested directly below. Identified by Photographs above. Note: Missing cover flashing.
Simulated Rainfall Test 4
Test type Clear water. Item Cover flashing to base of glazing. Findings Water drained into the drainage channel below. No leak was in evidence below. Identified by Photographs above. Note: Drainage channel filled with water due to poor drainage (see comment next page).
Flood Test
Test type Clear water. Item Drainage channel. Findings No water manifested at leak site whilst on site, although moisture readings to plasterboard increased from 40 to 70 by time of departure. Identified by Photographs above. Comment: Drainage was poor.

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