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Author Topic: Insulation for new basement
hawkdriver
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Posts: 2
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Post Insulation for new basement
on: February 9, 2016, 10:28
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Hello all,

I have searched the forms and have read on ton of info on this topic just looking for some recommendations given my setup. Walls are poured concrete in great condition no water in 2 yrs that i have owned. I have a waste pipe running 3/4 of the basement so i will have to frame infront of this pipe giving me 4-5 in standoff from wall itself. Im choosing steel framing with PT base plate. I insulated all rim joist with 2in xps with bat over top. Basement is very comfortable in all season location is eastern PA. So now you have a background here is my question. Do i need 2in XPS on wall since i have no water to my knowledge and have 4-5 in standoff from walls. I plan on bat in studs. Im not overly concerned with the insulation as far as warmth bc like i said its comfortable year round. The basement in sub grade with exception of 1 wall. My hang up is the cost of xps would put this over 1200 for xps alone. Is it necessary. Of course i will do it if its the right answer just not thrilled spending 1200 on it given i seen countless people saying don't both if i have such a standoff as moisture will not touch the bat fiber. Lastly I'm not running forced air rather elect fireplace when needed. Please let me know your thoughts. Thanks in advance.

Tony
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Posts: 58
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Post Re: Insulation for new basement
on: February 9, 2016, 11:18
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Alright good question. I'm going to say from my experience you won't need the extra XPS on the walls. If you're using bat insulation in the studs, I think you're golden. I'm no expert on local code in your area, but as far as waterproofing goes I don't think the XPS would save you from any moisture in the future. Anyone else can feel free to chime in, but that's my two cents from my experience.

Good luck on your basement finish and let us know if you have any other questions!
Tony

Founder and Owner of In Form Creations
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hawkdriver
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Posts: 2
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Post Re: Insulation for new basement
on: February 9, 2016, 16:12
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Just to update this I am leaning towards 1.5 xps. My concern is I still would have approx 3 in standoff between xps and framing due to the horizontal waste line. Building science states to frame tight to xps. I cannot. Is this a concern. Lastly how do i manage to create and airtight seal around the waste line only thing I can think is to xps above and below pipe then spray foam what I can. Is this acceptable.

carrie
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Posts: 5
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Post Re: Insulation for new basement
on: January 11, 2017, 03:23
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most of the existing basements are under-insulated or not insulated at all. They trap moisture within wall assemblies thus condensation, mold growth and rotting wall structures. Most of the practices adopted in basement finish doesn't take into consideration added moisture load below grade , or the amount of heat that will be lost to the ground. Before finishing your basement, fix moisture problems, decide where to begin with, test for moisture by tapping 2 foot squares of plastic sheeting to the floor and walls, use an awl to probe for rot and insect damage, check floor joists for sagging , pro-check fuel burning equipment, backup for battery backup for your main pump, DIY water proofing check this article for more tips on basement water proofing http://www.brothersplumbing.ca/blog/waterproofing-basement/tips-waterproofing-basement/ . fill larger cracks inside out with hydraulic cement, seal small cracks or gaps around pipes, slope soil away from foundation, install diverters to send gutter water min 10 feet from the foundation. Insulate pipes before boxing, finish foundation walls by ineterlocking panel systems, add partition walls if needed. Remember to leave space around mechanical s. For water resistant flooring a scratch resistant floating vinyl planks has a long warranty

romanheber
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Posts: 1
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Post Re: Insulation for new basement
on: March 13, 2018, 22:36
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If the basement is insulated and then it will trap moisture within in the wall and doesn't allow mold or yeast to grow which in turns lessen the cost of hiring waterproofing contractor to insulate the basement. Great idea, i appreciate your sayings.

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