Institute: Identify underlying causes so corrective measures can be taken

A resident showing water stains in his living room caused by a leak from inside the walls.

THE American Concrete Institute-Malaysia Chapter (ACI-MY) has also shared its findings on leakage issue at PPR Sri Aman in Jinjang Utara based on visual observations during a recent site visit.

Its observation was limited to level 16 of Block C and levels 3, 11, 16, and 17 of Block D as well as the the multi-storey carpark concrete roof slab.

ACI-MY is an independent select committee under the purview of the National House Buyers Association (HBA).

Based on its visit to the people’s housing project, it concluded that the water leaks or intrusion indicates that the structures are in distress.

The report stated that there is a need to find out what is contributing to this distress and also the level so that corrective actions can then be taken after factors leading to the water intrusion are identified.

Among its observations were the concrete ceiling at the corridor of level 17 is having water intrusion at the joint area of the slab and wall.

It added the joint at the slab and wall could have opened up or cracks in the concrete slab section could have occurred.

The possible causes could be due to, but are not limited to thermal movement, drying shrinkage, restraints and insufficient curing or a combination of factors.

As for the possible water sources, it could be coming from the domestic water supply pipes from level 17 and going into the level 16 ceiling via the joints or through cracks.

Additional indicators of water supply pipes leaking were that cement-sand screed topping at level 17 floor slab appeared to be fully saturated with water and the wall at level 17 also was found to have rising moisture symptoms.

It was also observed that the crack at the ceiling had continuous water intrusion.

There were also possible sources of water intrusion at residential units as living rooms, the external beams and ceiling slab joints above windows have visible water marks.

Leaks were also found at bathroom ceilings, as moisture could be seen originating from bathrooms directly above, which could be due to damage to the waterproofing membrane.

The joint at the connection between structural elements could have opened up or a crack of the concrete slab section could have occurred.

The possible causes could be due to, but are not limited to, thermal movement, drying shrinkage, restraints and insufficient curing or a combination of factors.

As for the wall dividing the living room and bathroom, water intrusion could be coming from the box-up section of the domestic wastewater pipe and spreading inside the ceiling of the bathroom as well as into the living room ceiling.

This can only be confirmed by hacking the box-up section for a visual inspection.

Over at the concrete flat roof at the multi-storey carpark, ACI-MY said there were localised cracks with water marks and stalactite formations which are indications of water intrusion.

There was fungus growth on the slabs indicating water intrusion, the report noted.

In conclusion, the report suggested that corrective measures, treatment and repair works be carried out.

It also recommended that domestic water supply pipes be checked for leaks by a plumber registered with a local water authority and and have the leaks rectified.

Among its recommendations are that sanitary pipes at the box-up section be checked to rule out any wastewater pipe leaks.

The existing waterproofing system, it added, needs to be checked by waterproofing specialists, certified engineers and architects.

The institute suggested that it would be good to involve the previous consultant and construction team as they would know the building best.

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leakage , PPR Sri Aman , Jinjang Utara


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