Why is my roof sagging?

Why does my roof have a sag (drop) in it?

It is very common to see undulation in a tiled roof on a older home. This can be caused by many reasons such as split rafters and strutting issues however the most likely is that at some point in the homes life the roof tiles have become aged and deteriorated.The sealant that is protecting the tile has deteriorated. When this happens the tiles can absorb water and become water logged which in turn doubles the weight of tiles to around 120kg per square meter. When the tiles become so heavy the timber cleats that they rest on (Barrup truss) have twisted or warped under pressure.

The roof however can be fixed.

If it is the rafters that are struggling under the load they can be reinforced with a tensioner thread(see pic below). This commonly used and quite effective. The wires are bolted to either end of the hanging beam and a thread in the centre of the hanging beam pushes the rafters back up into its original position.



Why is my ceiling in the garage sagging down?

The garage ceiling is a common spot to see large amounts of undulation in the ceiling linings. There are multiple reasons this can occur:

No insulation – No insulation above the garage is a very common in newer homes. It is a cost saving for the builder however it can cause major issues. During the cooler months of the year, moisture that is in the air that enters the roof void can easily settle on the reverse side of the plasterboard creating a softer product and weakening it at the stress points (fixings).

Ceiling paint – The paint used is the same as the interior ceiling white that is not moisture resistant. Therefore letting moisture penetrate the plasterboard.

The roller door top gap – The gap above the roller door can let wind blow freely into the garage causing the plasterboard ceiling linings to slap up and down on the ceiling joists slowly wiggling them loose at the screw points. Common signs of this are nail popping (when the nail head protrudes the plaster board) or alternatively the paint starts to flake directly above the roller door.


David Hall

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Excellent, polite, so detailed and thorough in the report; I was very pleasantly surprised. Highly recommend David. He also organised our pest inspection who we are equally happy with.
Thank you Quality Building Inspections :)
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Property in Mt Terrace GAWLER.
— Candice Blake
QBI are amazing. Very detailed, very in-depth reports that made the most of the inspection. Spent time answering all questions I had and were better value than other local inspectors - was even able to recommend a great pest inspector too
— Ricky Flynn
Have used David for a couple of properties now, wouldn't use anyone else. Incredibly thorough reports and great one on one conversations, explaining everything. Wouldn't buy a house without consulting him! He's helped me dodge a bullet before, that would of cost me a couple of hundred thousand.
— Liam Mcaulay
Dave was great, very informative, easy to talk too and ensured I seen the issues I needed sorted before putting house on the market. Was worth every dollar as the money spent on my issues I feel will ensure a smooth sale.
Thanks Dave.
— Damien
I had David do a preventative maintenance inspection on our butcher shop at the Gawler Green. It was a very valuable inspection as we found a leak coming from the tenancy next door. David's thermal imaging and moisture testing was used to find the problem . It was easily fixed before it became a big and expensive repair . His service was professional and great , I'll be using his maintenance inspections regularly.
— Joel Poulish
David provided an excellent service. Would highly recommend him
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Great experience; really prompt and easy, personalised service, extremely detailed report.
— Sherlene Heng
Great response, very quick and highly informative. I would highly recommend David and his team.
— Kirsty
David was thorough, punctual, friendly, and most of all very professional. He identified several imperfections and potential costly repairs. I used this as a bargaining tool and secured a great deal on my new home!
— David Ogilvie
David provides timely building inspection service with high quality. He is friendly, patient and frank. I’m more than happy to recommend him.
— Z You
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