Hi,am new to the forum. I've just bought a can of this for a space behind my toilet that's very draughty.There's practically no insulation at all,and the house is freezing because of this.I've noticed wires behind this,that are probably for the hot and cold water for the sink and bath. So mainly what am wanting to know is: can I use this expanding foam? Am a bit worried about these wires,and have no knowledge about these things at all. Any info would be good. Thanks.

After seven years in our home, we decided to expand our backyard concrete patio from a 10 X 10' slab to a 10' X 30' slab by adding a new 10 X 10' slab on either side of the existing patio. I got referrals through Angie's list and chose a contractor after a few quotes; he was "A" rated. He contracted to pour the two slabs with 4" concrete and #3 rebar at 14" centers on 2" of sand. The rebar was drilled and secured into the foundation of the house so it wouldn't separate from the house (the original slab was not so connected). The work was "guaranteed 3 years". The job required his crew to relocate two sprinkler heads from their former location where the new slabs would be to new locations at the corners of the new slabs. He said this would be no problem; he had 40 years in the business and did this all the time. I trusted his experience. Silly me. His crew removed the old sod, poured the sand, set the forms and rebar and moved the sprinkler heads on the first day. On the second day, they poured the concrete, and at this time I paid him the full amount in cash. After letting the concrete set for a day, I decided to turn on the sprinklers--they appeared to work just fine, but I was amazed to see a steady flow of water bubble up from between the house and one of the new slabs. The contractor was amazed, too. "That's not supposed to happen." Yeah, no kidding, I told him. I asked if he had tested the sprinkler lines for leakage BEFORE pouring the slab, and he said he didn't; he ASSUMED, he said, that I would be curious and run the sprinkler and check for leaks before the poured the slab (at no time did he ask me to do so; I thought he would do this as a matter of "best practice."). Thought that was a little ballsy of him to suggest it was MY fault I didn't check HIS work! He came over a few days later and cut a 2' X 2' hole in one of the slabs to access the sprinkler lines underneath and discovered that one of his workers had inadvertently broken the pipe. This repair work left a nice big hole with unsightly patch on the slab, which he assured me would age along with the rest of the slab and would tough to see afterwards. I wasn't pleased, but accepted his explanation. A week later, after running the sprinklers twice, I noticed that a big outflow of sand was spread out across the lawn near one of the corner sprinklers on the OTHER slab. A quick investigation revealed the sprinkler heads he installed were only 2 1/2" in height, not enough for the pop-up spray head to clear the top of the slab. As a result, they were spraying against the slab and scouring out the sand bed under the slab. Several hairline cracks--some not so hairline--had developed on that slab, running the full width and depth of the slab. At the same time, walking across the slab gave me a "hollow feeling" under neath; I could feel the slab flex as I walked. I went to the home improvement store and shelled out $1.67 EACH for proper 6" sprinkler heads and tried to pack what sand I could back under the slab. Obviously, the slab was now just suspended in thin-air with no sand under at least 1/3 of its area. At this time, I called him to come over and tell me about the sand, the insufficent sprinkler heads, and the cracks. This was dumfounding him as well. Why didn't they install a sprinkler head with sufficient throw to get over the slab? He said they used whatever sprinkler heads were "available" in their truck when they did the job. He packed a bit of sand back under the slab, and then sealed the edges of the slab where it had washed out with more packed dirt. He then went over the cracks with a sealant solution he said he used and said that should take care of it. I might add that the same sort of cracks had developed on the other, already patched slab, originating from the corners of where the hole had been cut to fix the sprinkler issue. He did the same with those. It's been a couple of weeks now since these repairs, and I'm still not satisfied. I purchased what I thought would be a professionally done job by an experienced team; the bumbling errors have created a sub-standard (in my opinion) slab that is already cracked and flaking in places. The old slab that came with the house--now 8 years old--doesn't exhibit a single crack. There's no pride in this work--I'm embarrassed when neighbors come over and look at the new patio to find it with an unsightly patch and cracks all over it. If I were the contractor, I wouldn't want my name attached to this job. Am I out of line in demanding that the contractor remove the patio work and either refund me the amount of the job, or pour me all new slabs? I can accept natural cracks due to aging of the work, but not cracks that immediately occurred due the poor competence of the contractor. It's like buying a new car with a big spot-welded patch on door. I look forward to your responses!