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Old 12-14-2011, 08:19 AM   #16
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cleaning up foundation walls for good foam board adhesion


Have you already bought the foam board insulation? If not, maybe you could get a more flexible 1 inch board or 1/2 inch.

In my case, I had to insulate to R-12 in order to get utility company rebate. So I bought 2 inch boards and 1/2 inch board. I'll go around the walls first with the 1/2 inch board because it's more flexible. Then I will attach the the 2 inch to that.

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Old 12-14-2011, 08:24 AM   #17
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cleaning up foundation walls for good foam board adhesion


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Have you already bought the foam board insulation? If not, maybe you could get a more flexible 1 inch board or 1/2 inch.

In my case, I had to insulate to R-12 in order to get utility company rebate. So I bought 2 inch boards and 1/2 inch board. I'll go around the walls first with the 1/2 inch board because it's more flexible. Then I will attach the the 2 inch to that.
I haven't just yet. I bought 2 inch foam (XPS) board and been using to it to seal the rim joists. So far it's made a nice difference in stopping the airflow into the crawl. I am also using to seal up the three vents I have down there. I did one last night and seemed to really stop the air flow. That's a good idea with using the 1/2 inch flexible first, might just have to try that. Thanks!
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Old 12-16-2011, 01:24 AM   #18
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cleaning up foundation walls for good foam board adhesion


Cleaning foam adhesive walls with pressure washers are really a bad idea. You need to contact a good cleaning services provider.

Thanks

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Old 12-22-2011, 06:09 AM   #19
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cleaning up foundation walls for good foam board adhesion


Anyone have an opinion whether I should glue and fasten the 1/2 inch and 2 inch boards together into the wall? Or should I only fasten the 1/2 inch into the wall then glue the 2 inch on top of that?
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Old 12-22-2011, 07:15 AM   #20
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cleaning up foundation walls for good foam board adhesion


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Anyone have an opinion whether I should glue and fasten the 1/2 inch and 2 inch boards together into the wall? Or should I only fasten the 1/2 inch into the wall then glue the 2 inch on top of that?
I would think if you glue and fasten the 1/2 inch to the foundation wall you would be fine to simply glue the 2" foam board to that. From what I hear that foam board adhesion is pretty bonding stuff and I think you'd get an exceptional bond when going to foam to foam because it's dry, clean and smooth vs. the foundation wall possible having moisture, dirty, rough and non smooth surface.

I am going to try and use PL-300 adhesive directly to the wall with 2" foam. I'll try it and see how well it holds up. If not I'll be using some type of anchor to the foundation wall as well but hopefully I can save some work and just use the adhesive. Good luck!
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Old 12-22-2011, 07:44 AM   #21
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cleaning up foundation walls for good foam board adhesion


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But, to hold the foam up, you could just put a pt 2x4 on the floor to hold a tight, slip the foam in behind that, than screw a 2x4 right in front of it at the top right into the joists to hold it in. Basically just the bottom and top plat of a wall.

I was curious if you considered this idea by Tim here? I think this is the way to go. Effectively you do build a wall but you will get the chance to put drywall in front of the foam for fire protection.

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Old 12-22-2011, 10:04 PM   #22
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cleaning up foundation walls for good foam board adhesion


Interior or exterior of wall?
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Old 12-24-2011, 11:42 AM   #23
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cleaning up foundation walls for good foam board adhesion


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I would think if you glue and fasten the 1/2 inch to the foundation wall you would be fine to simply glue the 2" foam board to that. From what I hear that foam board adhesion is pretty bonding stuff and I think you'd get an exceptional bond when going to foam to foam because it's dry, clean and smooth vs. the foundation wall possible having moisture, dirty, rough and non smooth surface.

I am going to try and use PL-300 adhesive directly to the wall with 2" foam. I'll try it and see how well it holds up. If not I'll be using some type of anchor to the foundation wall as well but hopefully I can save some work and just use the adhesive. Good luck!
You should have no trouble bonding the 2" foam to the 1/2" foam. The PL300 creates a very strong bond. I've used the stuff to bond XPS to itself. I would just be sure to brace the foam while it's curing. You should stagger the seams of the 2" and the 1/2".

Here's what I did for my project:

1. I roughed up the surface of the paint using a disc grinder and a paint stripper type disc.

2. I put down a lbead of PL-300

3. I ran several tapcons with fender washers into 2" foam, adding extra fasteners where irregularities in the wall made the foam pull away.

4. I sealed the seams between the sheets and at the top of the foam panels using PL-300.

5. (haven't started yet) Run Tyvek tape over the seams, just for good measure (it's cheap, right?).

6. Glue a strip of foam on top of the block wall

7. Remove the tapcons in the wall, filling the hole with PL300

8. Use PL300 to adhere a second layer of 2" foam to the first layer, bracing with 2x lumber.

9. Frame the wall right against the foam.

10. Fill the stud bays with Roxul
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Old 01-02-2012, 03:55 PM   #24
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cleaning up foundation walls for good foam board adhesion


I went to the big box store to pick up some tapcons to fasten the 1/2 board to the wall and I asked for advice on what size to get. He told me that drilling into red clay block foundation is a mistake and it would break.
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Old 01-02-2012, 04:28 PM   #25
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cleaning up foundation walls for good foam board adhesion


You mean you have a terra cotta block foundation? I would experiment with different wood screws and forget about using a hammer drill. I haven't worked with terra cotta, but I have had some success using small wood screws to secure cable clips directly to crumbly stucco. If you can't find a screw that works to your satisfaction, I would just apply the adhesive and brace the heck out of the panel. I would use small squares of plywood and 2x lumber with bags of concrete or olympic weight plates piled on top.

P.S.
I wouldn't go longer than 1" on those screws.

Last edited by benjamincall; 01-02-2012 at 04:44 PM.
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Old 01-02-2012, 10:11 PM   #26
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cleaning up foundation walls for good foam board adhesion


I honestly don't know if that's what it is. It's a red brick with crumbling mortar. It's got some white coating on it that I have been trying to scrape off.
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Old 01-02-2012, 11:08 PM   #27
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cleaning up foundation walls for good foam board adhesion


Is the brick hollow? If the white coating is cementitious, I would just bond the XPS to the coating.

Last edited by benjamincall; 01-02-2012 at 11:10 PM.
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Old 01-02-2012, 11:45 PM   #28
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cleaning up foundation walls for good foam board adhesion


I'm not sure if it's hollow. I think so but I'm not for sure. It's lasted all these years (built 1919) so I'd think if it were an inferior foundation it wouldn't have lasted this long.

Also, there are no footings underneath the walls. I checked and I've asked others to tell me if it has footings. They got out this flexible rod and poked underneath there and found no footings.

EDIT: Ok, it does appear to be terra cotta. I googled a bunch of pictures and I see the same grooves in the block that I see in mine when I scrape off the white coating.

Does that mean drilling in it is not an option since it's brittle? I'd sure like to get that foam board to adhere to the walls but it won't stick.

Last edited by strategery; 01-03-2012 at 12:37 AM. Reason: Found some pictures & new information
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Old 01-03-2012, 07:31 AM   #29
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cleaning up foundation walls for good foam board adhesion


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Originally Posted by benjamincall View Post
You should have no trouble bonding the 2" foam to the 1/2" foam. The PL300 creates a very strong bond. I've used the stuff to bond XPS to itself. I would just be sure to brace the foam while it's curing. You should stagger the seams of the 2" and the 1/2".

Here's what I did for my project:

1. I roughed up the surface of the paint using a disc grinder and a paint stripper type disc.

2. I put down a lbead of PL-300

3. I ran several tapcons with fender washers into 2" foam, adding extra fasteners where irregularities in the wall made the foam pull away.

4. I sealed the seams between the sheets and at the top of the foam panels using PL-300.

5. (haven't started yet) Run Tyvek tape over the seams, just for good measure (it's cheap, right?).

6. Glue a strip of foam on top of the block wall

7. Remove the tapcons in the wall, filling the hole with PL300

8. Use PL300 to adhere a second layer of 2" foam to the first layer, bracing with 2x lumber.

9. Frame the wall right against the foam.

10. Fill the stud bays with Roxul

I did very similar for my crawl space project but used different anchors "Red Head" as I had no luck with the tapcon anchors holding. It could have been I used them wrong, who knows. The Red Head anchors worked amazingly and were very simple to use. I bought over sized washers to secure the foam more to the foundation wall. I only used maybe a dozen of these in various spots as the PL-300 held very well for me but the area's the wall was out of whack or didn't get a good seal or was loose I used an anchor. I stayed away from the Tyvek Tape for the joints as I read on another forum the manufacture says to only use with Tyvek Vapor barrier and not on foam. I have heard it does not hold up well over time and will fall off but who knows for certain so to be safe I used Foil tape instead. I also used Roxul in my stud bays.
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Last edited by cbaur88; 01-03-2012 at 07:37 AM.
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Old 01-03-2012, 10:40 AM   #30
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cleaning up foundation walls for good foam board adhesion


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I'm not sure if it's hollow. I think so but I'm not for sure. It's lasted all these years (built 1919) so I'd think if it were an inferior foundation it wouldn't have lasted this long.

Also, there are no footings underneath the walls. I checked and I've asked others to tell me if it has footings. They got out this flexible rod and poked underneath there and found no footings.

EDIT: Ok, it does appear to be terra cotta. I googled a bunch of pictures and I see the same grooves in the block that I see in mine when I scrape off the white coating.

Does that mean drilling in it is not an option since it's brittle? I'd sure like to get that foam board to adhere to the walls but it won't stick.
I'd simply experiment with a couple of different fasteners. You won't need to put a lot of torque on them. You can buy a box of eight 3/16" x 1-1/4" hex head Tapcons for $2.75 at Lowe's. A 5/32" masonry bit costs about $2.50. I would not feel the need to embed the screws a full inch. Just run them in until they pull the foam snugly to the wall. You can probably get the Tapcons to do the trick if you avoid using hammer mode to drill your pilot hole and if you drive your screws slowly. You might try the Red Head brand fasteners, as suggested.

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