In my premiere blog, I will address a situation that was under discussion from ContractorTalk.com
The subject was about sill plates and what to do about a foundation where the mason, who was laying block, had a problem making the foundation level.
The framing contractor had shown up and in the process of doing the initial check found that the foundation tolerances (I will be making
an entry in this shortly) were not to his liking. The foundation is 1-1/2″ out of level.
I do not need to go into any rant at how bad this is, I feel almost anyone can realize in a general sense how bad this is for a home. I will explain some perspectives to what problems this will have even after fixing and also some ideas about how to fix.
First let me explain some general knowledge of tolerances and what us acceptable in my personal opinion of being a framing contractor for 25 years. Every contractor, every tradesman, every worker unconsciously has set their own personal tolerances. In a general sense, the ones with smaller tolerances usually put out a higher quality, more thought invoking product. This does not mean that larger tolerances produce less than acceptable work. It all depends on the context of the situation and the application from the end user.
But let’s get to the tolerances of this particular story. My
acceptable tolerance for leveling a floor is 1/8″. What this means to me when I am out in the field is that when I am leveling the framing
of the floor (which I will explain later) if I am looking through my Berger self leveling optical transit and take any reading that is more than +/- 1/16″ out of level, then I have to start thinking in my head questions I don’t want to waste time thinking about. “How will this affect me later on” is usually the primary and only question I want to ask myself.
1/8″ tolerance gives me peace of mind.
1/4″ is borderline and needs adjustment.
1/2″ is no good and definitely needs fixing.
1-1/2″ is ridiculous.
When you have something that is 1-1/2″ out of level, you will have problems, plain and simple. You cannot leave something like this at all. As a framing contractor, if you leave something like this and
have an attitude of “well, the mason didn’t care so why should I?” you will be compounding the problem to a point that there may be no
return. It will be a nightmare of a home and will be trouble at every stage of the project. It is unnecessary to do this. It is also unconscionable and shows a lack of caring.
So what needs to be done and how do you go about doing it? My preferred method, if the tolerance is small, is to bolt the sill directly to the foundation then shim under the floor joists to raise the lowest sections up to the highest point on the foundation. As you can see with our example of 1-1/2″, this will create more of a problem than helping so a different method will be necessary in the context of the situation.