How to Repair T1-11 Siding

T1-11 siding is a type of untreated wood siding that needs some special considerations when it comes to repairs. Often, the only protection the wood has against the elements is a coat of paint, so it can be more prone to rotting in an area with higher humidity levels. Some minor cases of T1-11 siding rot can be cut out and patched if confined to a small area, but the more common measure is replacement. T1-11 siding is also usually installed without any sheathing underneath, so the framing of the house will be exposed once the siding is removed. Working quickly is important when patching and repairing this type of siding, in order to avoid damage to the framing, insulation, or other internal structures.

Step 1 - Assess Siding Damage

Carefully examine your T1-11 siding for signs of mold, wood rot, or beyond-minor water damage. If the area of the siding you need to repair is larger than two to four inches, the best and most permanent solution is to replace that particular panel of siding. In cases of mold growth, the siding panel affected will need to be replaced, and it is a good idea to have a professional treat any mold to prevent it from returning. The good news is that T1-11 siding comes in panels that are relatively easy to remove and replace without disrupting the entire siding installation.

Step 2 - Prep for Patching

If you are able to install a patch over a small area of removed T1-11 siding, first locate two framing studs close enough to attach to the siding patch. If the area to be patched is not between two studs, you will need to cut a horizontal member wood to nail in between the two nearest studs. This will serve as a crossbeam to secure the siding patch. Use your framing square and tape measure to obtain exact dimensions for a patch large enough, and then cut a piece of siding with your jigsaw to fit.

Step 3 - Patch Siding

Attach your siding patch with at least four 8d nails, and seal all edges with a line of caulk. Apply a coat of primer and paint to the patch so that it matches the rest of the siding. It is recommended to periodically check patched siding to ensure no moisture is seeping underneath.

Step 4 - Replace Any Needed Panels

If you need to replace an entire panel or section of T1-11 siding, first remove any existing wood trim with your pry bar. Then check if the siding has been installed around any windows; if so you will need to temporarily remove the window frames as well before proceeding. Locate the lap of the old siding; this is the edge of the last piece that was installed and where you want to begin removing the panel. Use your pry bar to carefully pull the siding free, and remove any nails with your claw hammer as needed. With your new siding panel, reverse this process when securing it to the framing.