Location for vented soffits on gabled roof

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Location for vented soffits on gabled roof

Postby Sheryl » Sun Nov 12, 2017 7:32 pm

Hi

My house already has gable vents, I understand that it is important to also have vented eaves boards (soffits) and also that these should be located lower than the gable vents but cannot figure out how to do that other than on the sides of the house. My workers were going to put the vented soffits on each side of each gable but that will have them level with the gable vent so I think may not serve the purpose?

However the only other option at front and back of house would be the eaves formed by the tiles at the bottom of each gable, but this does not seem to really connect to the attic space. Alternatively I could do vented soffits along both sides of the house only, i.e. air will enter from sides and exit from the gables front and back, is that workable?

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Re: Location for vented soffits on gabled roof

Postby Roger Ramjet » Sun Nov 12, 2017 11:48 pm

Sheryl wrote:However the only other option at front and back of house would be the eaves formed by the tiles at the bottom of each gable, but this does not seem to really connect to the attic space. Alternatively I could do vented soffits along both sides of the house only, i.e. air will enter from sides and exit from the gables front and back, is that workable?

Just a word of caution that I am currently paying dearly for in regards to venting. Some of my vented soffits have come down. I had them at all four corners but after a very heavy horizontal downpour the pressure that built up in the roof space was just too much for some of the soffits and they became detached from the steel wires holding them in place and where they were joined to the Colorbond. The main reason was the plasterboard they had used and had gotten wet and the fact that four vents were just not enough for the size of the roof. We are currently trying to locate a specialist in soffits to come in and replace all the ones that have disintegrated.
They ones that fell just "exploded" downwards from the pressure build-up. It was a hurried job anyway and the materials used were not top of the line and their thickness was not what you would can sufficient. They all got blown down on the four corners of the house where the fly screen were over them.
The next stage will be to get water resistant ones and put in enough to take the pressure build-up inside the roof when the next monsoon hits.
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Re: Location for vented soffits on gabled roof

Postby Sheryl » Mon Nov 13, 2017 1:50 pm

Thanks. I will be putting in about 20 vented soffits, hopefully that will be enough. All along either side of the house and in the area in the middle of the back. I have 4 gable (exhaust) vents and will add a 5th.

I am not clear why the venting makes it more likely for pressure to build up in the roof?? Did you have enough our=tflow (exhaust vents)?

Currently I have non-vented soffits, up for 20 years no problems. But I will be sealing up the eaves with filler so they are essential to add.
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Re: Location for vented soffits on gabled roof

Postby Roger Ramjet » Mon Nov 13, 2017 7:39 pm

Sheryl wrote:I am not clear why the venting makes it more likely for pressure to build up in the roof?? Did you have enough our=tflow (exhaust vents)?

If you have a look at my roof it's nearly flat with 1 metre skirts along all sides (a bit like a factory roof) to allow access to electrical and other things over the ceiling and a crawlway. I had vents at all four corners to allow airflow, but with the flyscreen mesh over the vents, apparently not enough air was going out. To be honest it sounded fantastic when each soffit blew, although my dogs had a different opinion. My wife also had a different opinion and had me out in gale force winds with the torch just to get her own back.
My wife was worried the roof was going to come off, but I told her it would take more than that to lift the Colorbond that is cyclone proof. We have had numerous people out to quote, but all wanted to go back to the original design using the same material, so we are waiting for the next round of inspections by the next potential gyppies to see what transpires. They either do it my way or they can wave goodbye to the job. This time I will increase the vents by double and we'll see what happens then.
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Re: Location for vented soffits on gabled roof

Postby Roger Ramjet » Mon Nov 13, 2017 7:39 pm

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