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Insulating Vertical Support Posts for Lintels

  • 12-10-2012 11:59am
    #1
    JOSHUA07
    Registered Users, Registered Users 2 Posts: 20 ✭


    Hi folks, hoping to fit 2 Lintels tommorrow (1 corner Lintel and 1 Bay) so I will have 3 Support posts. I was just wondering if anyone could recommend a way of Insulating the inside of the Posts or would it need doing at all. Thanks in advance....


Comments

  • #2
    BryanF
    Moderators, Home & Garden Moderators Posts: 10,145 Mod ✭✭✭✭BryanF


    JOSHUA07 wrote: »
    Hi folks, hoping to fit 2 Lintels tommorrow (1 corner Lintel and 1 Bay) so I will have 3 Support posts. I was just wondering if anyone could recommend a way of Insulating the inside of the Posts or would it need doing at all. Thanks in advance....
    what do your detail drawings show? what is the psi value your aiming for?

    insulating internally : maybe areogel could be the neatest then plasterboard


  • #3
    kieranhr
    Registered Users, Registered Users 2 Posts: 131 ✭✭kieranhr


    First of all, yes, it definitely needs doing. If not you'll have warm windows and a cold post, equals condensation on the inside of the posts.

    What I generally do is wrap the inside of the post with 25 mm of PIR insulation before plasterboarding. Being a rigid insulation, it'll take a bit of care in the cutting to get it right. You can use an insulated plasterboard if you want.


  • #4
    JOSHUA07
    Registered Users, Registered Users 2 Posts: 20 ✭JOSHUA07


    I was thinking of drilling a couple of holes in the post and spraying some Expanding Foam inside. Has anyone done this? surely doing this and wrapping the post before plastering would help?


  • #5
    kieranhr
    Registered Users, Registered Users 2 Posts: 131 ✭✭kieranhr


    You think so, but no. Spraying expanding foam inside the post is a waste of time. It's the solid steel cold-bridge that conducts the heat straight from inside to out. Trapped air is actually a pretty good insulator on its own, and replacing it with foam won't make any substantial difference. It's the same with builders who pump bonded bead insulation into a hollowblock wall. Again, a complete waste of time and money..


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