[Big Cat]

My new home has 4 vinyl sliders in the basement. The contractor installed the windows using 2x4 untreated pine for the top header which sits on top of the concrete sill (not really weight bearing, just something to attach the top of the window to). Should these have been treated 2x4s being they make contact with the concrete sill? None of the homes in the subdivision that are built by the same contractor have treated wood over their windows either. I thought code required any lumber that makes contact with concrete needed to be treated or have a barrier between it. I live in Ohio. Thanks for any input.

 

[Windows on Wash]

In theory, yes.

We normally run PVC in this case because it isn't 1.5" in depth.

That concrete (above grade) should be pretty dry. The rule of thumb is that you need either a capillary break or run PT or PVC lumber.

 

[Gary in WA]

Welcome to the forums! Yes, it definitely should have a waterproof barrier (per code) or PT wood IF any of these apply; http://publicecodes.cyberregs.com/icod/irc/2009/icod_irc_2009_3_sec017.htm

Even PT wood wicks water. Concrete is porous like a sponge, does the wind blow water on concrete wall as it drips from house wall/siding during a rain... unless is doesn't rain in Ohio... lol.

Gary

 

[Windows on Wash]

From Gary's link, #2 would likely be the most applicable.

2. All wood framing members that rest on concrete or masonry exterior foundation walls and are less than 8 inches (203 mm) from the exposed ground.