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  1. #16
    Join Date
    Dec 2013
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    56
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    Default

    Quote Originally Posted by bwal74 View Post
    Went into the Big B today, and went online to check out some other options. This is what I'm thinking:

    https://www.bunnings.com.au/expol-12...-pack_p0810837

    for the insulation, cheap enough and looks like it would be easier than installing batts. And:

    https://www.bunnings.com.au/customwo...panel_p0590079

    to seal off the ceiling. Same reasons, cheap and easy to install. I might need to paint both sides though.
    Just remember by the time you add sealing undercoat as that stuff is thirsty and paint the price is going up.
    Why not malimine 16mm white board, it's around $30 odd a 1200x2400 sheet and needs no paint and is sealed both sides.
    Using Tapatalk

  2. #17
    Join Date
    Oct 2011
    Location
    Sydney, NSW
    Posts
    1,249

    Default

    Quote Originally Posted by Dave J View Post
    Just remember by the time you add sealing undercoat as that stuff is thirsty and paint the price is going up.
    Why not malimine 16mm white board, it's around $30 odd a 1200x2400 sheet and needs no paint and is sealed both sides.
    I had a look at the malimine, but I'll probably do everything myself (Corvid-19) and probably just be standing on a work table and climbing through the trusses. So I think it may be too heavy for me to lift into place and secure. Plus there will be a lot of cutting out to fit the sheets.

    Ben.

  3. #18
    Join Date
    Jul 2011
    Location
    Berowra Waters
    Posts
    149

    Default Don’t use MDF

    Quote Originally Posted by bwal74 View Post
    Went into the Big B today, and went online to check out some other options. This is what I'm thinking:

    https://www.bunnings.com.au/expol-12...-pack_p0810837

    for the insulation, cheap enough and looks like it would be easier than installing batts. And:

    https://www.bunnings.com.au/customwo...panel_p0590079

    to seal off the ceiling. Same reasons, cheap and easy to install. I might need to paint both sides though.
    Don’t use MDF, it’s rubbish, even painted, it will absorb moisture, swell, bow, break up, and cause you pain. 4 mm bracing ply or OSB board would be better. MDF is scheeit.

  4. #19
    Join Date
    Jul 2006
    Location
    Athelstone, SA 5076
    Posts
    4,255

    Default

    also paint the walls white...it will reflect light as someone else above for floor

    spray painting it wont take long

  5. #20
    Join Date
    Nov 2011
    Location
    Port Sephens NSW Southside
    Posts
    123

    Default

    Ben
    Check out Trademaster at 46-52 Ferndell St, South Granville, if it's not to far, depending on where you work.

    https://trademaster.com.au/

    I picked up a 25mm sheet of MDF 1800 x 1200 a couple years ago for $30.

    JohnQ

  6. #21
    Join Date
    Jul 2011
    Location
    Berowra Waters
    Posts
    149

    Default

    Quote Originally Posted by riverbuilder View Post
    If you wanted to remove the ceiling joists, you could replace them with collar ties, they could go about 1/3 of the way up from where the rafters sit on the wall plates. Simple 4x2 with BOLTS through the rafters would be enough. Probably on every second rafter and at each end. But, I’m only a builder not an engineer.

    edit: I just realised you said it was a trussed roof, can’t cut anything out of a truss, it will fail.
    edit of the edit: Thats a cut and pitched roof, not trusses.

  7. #22
    Join Date
    Oct 2011
    Location
    Sydney, NSW
    Posts
    1,249

    Default

    I bought a pack of polystyrene insulation from Bunnings. It was 470 mm wide and 1200 mm long. You just break off the extra edge to make it fit, messy but works well. It is meant for under floor insulation but it will do the job.

    I'm still thinking of 6 mm thick MDF sheets as it Cheap, light and easy to fix to the trusses. I'm not worried about moisture getting into it as it's pretty dry in there and I've noticed any leaks (so far).

    Ben.
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  8. #23
    Join Date
    Dec 2009
    Location
    Melbourne
    Posts
    134

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    6mm MDF will bow from ambient humidity plus gravity.

    I would splash the very minimal amount more for the Melamine sheet, and what the sheets cost extra you will save in sealing and paint costs.

  9. #24
    Join Date
    Nov 2017
    Location
    Geelong, Australia
    Age
    57
    Posts
    2,651

    Default

    The 6mm MDF is 14kg per 2.4x1.2 sheet and $23 from Bunnings.
    4mm brace ply as Racingtadpole suggested earlier is 7.3kg per sheet, and $27.

    Up to you, but I know which I'd be using!!

    Steve

  10. #25
    Join Date
    Dec 2009
    Location
    Melbourne
    Posts
    134

    Default

    Quote Originally Posted by OxxAndBert View Post
    The 6mm MDF is 14kg per 2.4x1.2 sheet and $23 from Bunnings.
    4mm brace ply as Racingtadpole suggested earlier is 7.3kg per sheet, and $27.

    Up to you, but I know which I'd be using!!

    Steve
    This, very much. Didnt notice how cheap the brace ply is, and it is far more easily painted than MDF.

  11. #26
    Join Date
    Dec 2010
    Location
    Syd
    Posts
    492

    Default

    Mate up a bit beyond Nth Richmond runs water on his roof during the summer months, recirculating water tank and pump. On those mid 40 degree days another friend measured the roof temps without water on his tin shed with an IR thermometer - CNC won't run at those temps. He's got the usual foil backed insulation in place on the concrete tiled one, but possums love getting between that and the tiles to sleep during the day in the cooler months.....and leave their calling cards all over the floor at night.
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  12. #27
    Join Date
    Oct 2011
    Location
    Sydney, NSW
    Posts
    1,249

    Default

    Quote Originally Posted by Hunch View Post
    Mate up a bit beyond Nth Richmond runs water on his roof during the summer months, recirculating water tank and pump. On those mid 40 degree days another friend measured the roof temps without water on his tin shed with an IR thermometer - CNC won't run at those temps. He's got the usual foil backed insulation in place on the concrete tiled one, but possums love getting between that and the tiles to sleep during the day in the cooler months.....and leave their calling cards all over the floor at night.
    HI,

    I'm lucky that my garage is tiled and not a metal roof, it's also high enough to let the heat escape. There's four of the brick inserts that have the holes in them around the garage at about the 2 metre mark, plus a door, window and the garage door so I can get plenty of circulation. I'd hate to be in a normal sized garden shed or such. Last year out at the RAAF base we had some 45 degree plus days and it was unbearable.

    I did half of the polystyrene insulation yesterday, it looks better than I thought. The temperate felt cooler but it wasn't a particularly warm day, about 28 degrees. I didn't notice any bird or rat nests in the rafters yesterday but I did find an empty old wine bottle someone had stashed up there.

    Ben.

  13. #28
    Join Date
    Jun 2007
    Location
    Ipswich QLD
    Age
    68
    Posts
    1,996

    Default

    Do not use polystyrene! One spark one overheated electrical cable, plug, light and you'll be building from scratch not to mention tools gone.

    Oh well to late I see your post above just now

  14. #29
    Join Date
    Jun 2007
    Location
    Ipswich QLD
    Age
    68
    Posts
    1,996

    Default

    Leaks may not be the problem condensation however will be using polystyrene. It also will retain the heat & cold inside like a cool/esky etc does

  15. #30
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
    Posts
    6,439

    Default

    Hi Ben,

    I have one of those 5 foot long, 200 Watt tubular frost heaters, that is connected to a 40 F thermostat. It only comes on when the shed temperature gets low enough to cause condensation. The shed temperature very rarely gets below 45 F so the heater doesn't come on too often.

    It spends its time on the floor at the back of the workshop, in the gangway, so far I've not managed to trip over it.
    Best Regards:
    Baron J.

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