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Thread: Roof insulation help for shed
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21st August 2023, 09:58 AM #1Senior Member
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Roof insulation help for shed
Winter has been dreamy in the shed but I’m dreading the return of summer. On a summer arvo the space will hit 35 degrees on a good day, which makes woodworking somewhat unenjoyable. I’ve got insulation in the walls covered with 12mm ply. However, the roof has nothing. The roof is a brown tile and it gets hot! See picture for what it looks like on the inside. Basically I ripped the ceiling out and just have the framing exposed.
I was thinking of getting some R2.0 90mm batts to stick between the framing. 90mm is the width of the framing so any thicker and it would be squished, which I think is not good? Hoping someone can help with a few questions:
Is R2.0 worth it? I think it would make a massive difference even if not the best rating.
What’s the best way to secure the batts? I was thinking some thin metal strips nailed in would suffice?
Is it ok to leave the underside of the batt exposed? I can imagine it collecting mountains of dust in a wood workshop.
There is already this old rubber barrier (sarking?) between the tiling and the frame. Is that enough of a barrier? Is it ok to have the batts resting against that?
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21st August 2023, 05:42 PM #2SENIOR MEMBER
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Shed roof insulation
How about some anticon rolls? You can have the silver side down, and tape the joins and nail/staple to the battens
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21st August 2023, 06:48 PM #3
This may be excessive but remove all the tiles, they would be redish colour and cement based....attract absorb heat. replace with silver corro iron, In Syd you should be able to get decent quality S/H sheets.
For inside Id start with heavy chicken wire or fine mesh, cover over top with white shade cloth or something similar then ass your insulation batts then a waterproof membranerthen the corro iron.
You would need to pick your weekend and work like buggery or have some mates around for a barbieI would love to grow my own food, but I can not find bacon seeds
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22nd August 2023, 10:13 AM #4Senior Member
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Hadn't heard of anticon rolls before, thanks.
Definitely not redoing the whole roof! I agree that would be ideal but budget and time aren't going to allow that. The batts were appealing as easy to do and pretty cheap. Although not ideal, if they do a decent job without any major downsides that would be my preference.
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22nd August 2023, 01:37 PM #5Senior Member
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+1 for Anticon roll. Much better to have a reflective layer than not.l, and will reduce dust gathering up there and also help spread light
Do those LED strips provide enough light, or are they supplemented by other task lighting?
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22nd August 2023, 04:35 PM #6Senior Member
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I have 6 plug-in led lights in addition to the led strips. I actually made little brackets for them so they just hook onto the ceiling joists so I can move them around as needed.
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22nd August 2023, 04:53 PM #7Member
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I looked at shed insulation methods a couple of years ago. I've forgotten what my conclusion was for my particular project (the project was cancelled) but I do know I was surprised at the complexity of the issue if it was to be done correctly.
These are some of the factors that need to be considered:
- air gap sizes between different surfaces
- silver foil on insulation faces roof or faces floor
- thickness of insulation (and R rating of course)
- drainage for condensed water
- local environmental factors (rainfall, humidity, temperature differences between night and day, etc)
- pest intrusion
Each of these items requires an answer before you can get the correct result for your particular project.
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22nd August 2023, 06:33 PM #8Senior Member
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All good points harry wall.
Re the silver foil, it is 'always' double sided foil, and the coloured side has virtually no impact on its performance re radiant heat. The coloured side is merely to prevent sun blinding the installer (and passers-by while exposed) on external walls and roof areas.
Re condensation, anticon blanket prevents this (hence the name) when directly under steel roofs, but thinking about my "+1" again for this situation, I'm now not sure about it under tiles. The tiles would need to be 'perfect' for it to be at all long-term stable. Certainly wouldn't want leaks directly onto the blanket side.
So perhaps Foil Board Insulation would be a better option to retro fit.
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22nd August 2023, 06:36 PM #9
Relevant to "local environmental factors" as noted above, is the shed in a predominantly cold region or warm region? It will govern what you do/is required.
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22nd August 2023, 07:28 PM #10Senior Member
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As a retrofit, nothing will be perfect and anything will be better than nothing
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22nd August 2023, 07:58 PM #11Senior Member
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I’m on the Sydney central coast. I can deal with the winter cold. But it’s the summer heat that is a killer. It gets unbearably hot inside. Typically about 30-35deg inside on a hot summer day. If I can shave that down to high 20’s that would be ideal. Not sure how much impact I can make with a retrofit though.
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22nd August 2023, 08:01 PM #12Senior Member
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22nd August 2023, 08:14 PM #13Senior Member
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22nd August 2023, 11:13 PM #14Senior Member
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+1 for Foilboard I used it four years ago and am happy with the results. Pictures in this post #24
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23rd August 2023, 12:13 AM #15Senior Member
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Don't know what it's called, but my all steel 7.5 x 6 M shed was built with a thin double sided reflective foil sandwiching a foam sort of inner core under the roof as part of the deal from the shed builder. I don't think it does much for insulation in hot or cold weather.
I've given a bit of thought to the heat issue, which is no fun in summer, and am inclined to put an insulated ceiling about 300mm under the roof sheets and either passive or power ventilate it to remove the hot air radiated from the roof sheets. Foilboard seems the quickest and easiest to install.
Then I think some powered fans in opposing walls under the ceiling gable should clear out a fair bit of the little heat that comes through the ceiling and the remaining bulk of the heat that comes from the walls.
Cold weather isn't much of an issue as my wood heater makes it comfortable as currently built.