T1-11 siding is not waterproof because it is not treated with any resins and chemicals that repel moisture. T1-11 siding needs to be protected against the weather with primer, paint, or stain. You also need to caulk around doors, windows, joints, and nails to keep the water out.

What does T1-11 stand for?

Plywood and other compressed wood siding products are an inexpensive way to sheath outdoor buildings, sheds and other projects. T1-11, sometimes noted as T111 or T1, is an example of one of many such wood siding products. The ‘T’ in T1 stands for “textured,” which references the grooves or channels cut into the siding.

Do you need plywood under T1-11 siding?

Even though it may not be considered necessary, many builders feel it is best to use plywood under T1 siding if the structure will be used for human habitation. All joints and seams need to occur at studs or horizontal bracing or plates to ensure there is solid backing.

What thickness T1-11 should I use?

The most common T1-11 siding sheet thicknesses are 11/32”, and 19/32”. For most applications, you only need the thinner versions, as you won’t need the structural strength that ¾” siding imparts. The grooves in T1-11 siding may be four or eight inches apart, depending on the mill that made it.

Is it better to paint or stain T1-11 siding?

On rough sawn T1-11, stain will penetrate even better. l also recommend acrylic stain if you want to preserve the wood look of the siding. Paint is a lot thicker and hides more of the surface texture than stain does.

What type of siding lasts the longest?

Types of Siding and How Long They Last
Vinyl Siding: 60+ years (warranties last between 20-40 years)Fiber Cement Siding: 50+ years.Stucco Siding: 50-80 years, depending on how it is backed.Metal Siding: Up to 40 years.Wood Siding: 20-40 years.

What is T1-11 siding used for?

Plywood T1-11 is also known simply as plywood siding. A versatile material, it can be stained to simulate a natural wood look, or it can be primed and painted.

Is T1-11 treated?

T1-11 siding features narrow, evenly spaced grooves on a rough-finished board for a pastoral appearance. Pressure treated for above ground applications, T1-11 siding features grooves spaced either 4″ or 8″ on-center to provide options for achieving the look you desire for your home, shed or pump house.

How do you seal the bottom of T1-11 siding?

Trim the siding with one-by-four-inch wooden trim, covering the gaps around windows and doors, under the soffit and on the corners of the house. Nail the trim with two-inch galvanized nails, then caulk around it with acrylic latex caulk.

Does T1-11 come in 10 foot lengths?

A: No, it doesn’t come in lengths longer than 10 feet.

What is Z flashing used for?

The Z flashing is used as a horizontal joint between one-inch siding to keep moisture out. It is used where siding meets horizontally.

Do you need sheathing under plywood siding?

It is completely okay if you were not aware that there’s no sheathing under siding until you removed it. Sheathing works as a case or cover, structural support, insulator, and more. Missing sheathing is not any structural defect. It’s possible that it was not added to the construction plan.

How far apart are grooves in T1-11 siding?

T1-11’s grooves and shiplap edges run parallel to its 8-foot-long edge. The T1-11 siding’s 1-inch-wide, 1/4-inch-deep grooves are spaced 11 inches apart.

How can I make my T1-11 siding look better?

Trim It. T1-11 sheets come with solid or grooved faces, and many installers under-trim it, leaving joints between boards uncovered and visible. Covering these joints, especially horizontal ones between stories, with 1-by-4-inch trim improves the appearance of the siding by making it look more finished.

Do you have to paint T1-11 siding?

T1-11 siding is wood or wood-based siding for your home. You should paint T1-11 siding with a high-quality acrylic exterior paint.

What nails are used for T1-11?

Trim T1-11 with 1- by 3- or 4-inch lumber. Nail the trim to the corners of the house and around windows and doors with 8d galvanized finish nails. It is also common practice to trim the tops to the sheets, where the wall meets the soffit, and the bottoms, where it meets the foundation.