Our house has two large masonry fireplaces which we never use. In Winter, these are a source of cold air entering the house. The dampers are closed, but still a lot of cold air is admitted thru these fireplaces. Over the Summer, I want to insulate these openings so they don't allow cold air to come in next Winter. Thought I would get some styrofoam board and cut a plug to fit the from opening of the fireplace. Would appreciate any other ideas anyone may have.
Thanks, Des.
Glass doors.
Ask this old house had an epsode on this, They installed a spring loaded vent cap. ~$400.00 It had a pull that you could open or close the vent cap from inside the fire box.
I looked into glass doors and 99% have air gaps, Zero sealing, only maybe 1000 $ units looked good to stop air with only R 1 I took 3/4" L angle iron steel from Ace l and screwed them all around inside my fireplace with Tapcons Then 4" foamboard and stuck 1/2" stripmagnets on the foamboard , I painted the foamboard the color of the fireplace. It pops in or out and has 100% airtight seal with R 20 Cost apx 20 $ and all that cold is kept out.
I have a cap that closes and pulls down , It doesnt stop cold air because the brick is cold, A plug is best good doors second best.
That is a Lyemance Top Sealing Damper. I have them on my commercal site:
Thanks for that. Sounds like a real good and inexpensive solution to the problem. I will give it a try. Des
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