Dry Laid Stone Foundation - Exterior Treatment (via John Nicolas)

How do you treat the outside of a stacked stone crawl space wall?  I have specified 2 part spray foam for the inside.  There is much evidence of rodent entry and exit inside without and visible holes on the outside.  What types of work do people specify and what about some cost estimates?

Tags: Foundation, Masonry, Rodents, Stone

Views: 610

Replies to This Discussion

If the dry stack is in good shape, I don't recommend messing with it except to fix any slope / drainage issues around it - if it isn't you need to get a stone mason to look at it.

 

This is a case where it is best to handle the issues from the inside, generally with infloor drainage, dimpled drainage mat, and closed cell foam. I am assuming you are looking at going with a sealed crawl space seeing you mentioned the foam

 

As for the critters I am going to cheat & point you to an article I did on keeping squirrel's mice & raccoons out of the house

Hi John, John, and Sean,

Once the structural issues as Sean mentions are out of the way I have suggested in the past that the inside be sprayed or hand mortared to fill all of the gaps so that the critters will not find a soft foam filled way to regain their access.  Foam applied from the inside does look nice, but would not be effective on critters, at least the ones I have had to deal with.  

As for cost, a mason would not take that long, especially if the surface was going to be covered with foam.  If the pool guys were not bust, they spray pools in a similar fashion and perhaps their material would be suitable.  Stucco applications might also be worth considering depending upon your area.  So, whether it is by hand or machine, an inch or two of mortar in those gaps should work well to eliminate the unwanted guests.

 

Bud

My 1850's Greek Revival has a dry stone foundation. I sprayed the inside from the floor to the top of the rim joist with 2.5" (R-15.5) of closed cell foam but did nothing to the outside (granted, the dry stone foundation was only below grade but had granite foundation stones above it). After two winters, there is no sign whatsoever of rodent entry, whereas before they were all over the place. It appears they don't like the stuff. The foam was ComfortFoam from BASF covered with a code-required flame retardant paint. Total cost: $5665 for a 2862 sqft house (sorry, I don't have the square feet of foundation area).

 

David

RSS

Videos

  • Add Videos
  • View All

Twitter

Latest Activity

George Matthews replied to George Matthews's discussion Shortridge 8400 Flowhood for A/C airflow testing in the group Energy Auditing Equipment for Sale, Trade or to Purchase
"Here are the pics of the flowhood and airdata manometer"
yesterday
Sarah Holloway posted a photo
yesterday
Joe Urycki added a discussion to the group Energy Auditing Equipment for Sale, Trade or to Purchase
Thumbnail

TEC blower door and UEI combustion analyzer for sale

For sale is one used TEC Minneapolis blower door system: Includes model 3 fan with rings A and B,…See More
yesterday
John Nicholas replied to Kevin Emerson's discussion Studies re: radon mitigation and energy efficiency
"The Nay side is well represented with the links already posted. I presented a neutral side, with…"
yesterday
Ray Lehman replied to Kevin Emerson's discussion Studies re: radon mitigation and energy efficiency
"Hey John, Thanks for the information.  Very good empirical data. While I agree that running…"
Friday
John Nicholas replied to Kevin Emerson's discussion Studies re: radon mitigation and energy efficiency
"I have no links, just some anecdotal evidence. I had several Blower Door Tests done on my own home.…"
Friday
Chris Laumer-Giddens commented on Chris Laumer-Giddens's blog post Raising the BARrier in North Carolina Mountain Home, Air Tight Ceiling
"@Joe Nagan, We have found this technique to be WAY simpler and A LOT less labor than making a…"
Thursday
Judy Rachel replied to Blake Shurtz's discussion Testing spillage on induced draft furnace?
"I hope the attached picture is clear enough for you to see.  As the caption on the picture…"
Thursday

© 2016   Created by Lawrence Berkeley National Laboratory.   Powered by

Badges  |  Report an Issue  |  Terms of Service