Does Outdoor Wood Trim Require Sealing?

Rot-resistant woods like cedar, redwood, or composite materials are essential for long-lasting and durable exterior trim. These woods should be resistant to rot and moisture, as they are more likely to resist decay and insects. Regular pine is not recommended for exterior trim due to its potential for moisture to reach the wood.

For exterior trim, it is important to check trim condition, including cracks, holes, and damaged areas. The best type of wood for exterior trim is either cedar, redwood, or pressure-treated pine. However, regular pine may not be the best choice due to its resistance to decay and insects. Composite and fiber cement are good choices for exterior grade wood trim, but they are more expensive than finger jointed options.

To ensure longevity, it is crucial to properly prime and paint the wood with exterior paint, applying new paint regularly according to manufacturer guidelines. Prime/paint all six sides of the trim before installing it, and do not use pressure treated wood on finish surfaces. Pressure-treated wood is not meant for use on finish surfaces, and chemicals used to resist rot often leave behind a greenish tone on the wood.

Preservative-treated trim from Belco Forest Products can solve issues inherent with solid wood trim and offer a better alternative to plastics. If patches of rot-softened wood have become discolored, crumbling apart, or have a spongy, stringy texture, it is important to get it treated. Softwood can still work well if backprimed and painted, and every cut was well painted before installation.

What wood doesn’t need to be treated?

Redwood, cedar, juniper, bald cypress, pacific yew, chestnut, black locust, osage orange, and black walnut are woods resistant to decay and insects. Alternatives to treated wood include native decay-resistant woods, exotic decay-resistant woods, composite woods (plastic woods), vinyl, and rubber. The heartwood of decay-resistant species is durable, and its decay resistance is listed in the Wood Handbook and AASHTO standard specification, M 168. Rubber wood and solid- and hollow-core plastic-wood composite decking are also alternatives.

Can you use non treated lumber outside?

Non-pressure treated wood is generally not recommended for exterior structures, but cedar, redwood, and IPE are common species used for exterior decks due to their natural resistance to weathering. Cedar can weather naturally with minimal structural degradation, but requires annual sealing maintenance to maintain its original color and appearance. Low-maintenance decking options include composite, composite vinyl-capped, and PVC, as well as aluminum decking, which is a metal variation on plastic polymers. However, there is no “maintenance-free” decking, and there is no “maintenance-free” decking.

Does all exterior wood need to be treated?

Building codes dictate where treated wood can be used, typically in areas with moisture risk. Outdoor wood should be pressure-treated, while interior design wood like cabinetry or furniture doesn’t require the same level of treatment. The AWPA states that the type of wood treatment depends on its usage, and extra steps are needed to finish pressure-treated wood in indoor or outdoor projects that may come into contact with humans or pets.

The chemicals in pressure-treated lumber are pesticides, so handling them with the same precautions as any potentially hazardous material is crucial. Wearing gloves and face protection is recommended, as sawdust from cutting the wood can be irritant.

How do you keep wood trim from rotting?

To replace rot-damaged wood or PVC trim, use high-quality exterior caulk to seal joints, and if using PVC trim, use a PVC-specific solvent-based cement for waterproof bonds. This prevents moisture infiltration, reduces rot risk, and enhances trim durability. Prepare the new installation for paint to enhance appearance and protection against elements. Lightly sand the surface with 220-grit sandpaper to ensure a smooth surface for painting, removing dust with a tack cloth before proceeding.

Should outside wood be treated?

In the absence of treatment, wood exposed to the elements is susceptible to a range of deterioration processes, including ultraviolet (UV) degradation, silvering, greying, and moisture damage. These can collectively lead to the proliferation of mould and the onset of wood rot. To clean, sand, stain, and finish outdoor wood, it is recommended that an outdoor wood preserver be used to protect it from biological growth. It is further recommended that the wood be treated with the preserver annually or once a year, depending on the finish used.

What exterior trim won’t rot?

Rot-resistant woods like redwood, red cedar, Alaskan yellow cedar, and Port Orford cedar have been the primary choice for exterior trim since the late 20th century. These woods are durable, easy to work with, and fasten and paint well. However, they are soft and can dent easily. The dust and oils in these woods are toxic to those who cut and sand them, and their cost has increased due to a dwindling stock of old-growth trees.

There are alternatives to these woods, such as cypress, white oak, or locust, which offer nearly the same rot resistance as redwood but are harder and more dent-resistant. These woods are cut from a dwindling stock of old-growth trees and are priced out of most high-end jobs. Choosing the right wood for your project depends on your location and preferences.

What happens if you use untreated wood outside?

If your outdoor wood is untreated, it’s crucial to treat it immediately to prevent rot, fungi, and weathering. Use a wood preservative, either a wax-enriched preservative or a wax-free preserver, for an all-round coating. If the wood is dip-treated or paint-stained, it may fade after 6-12 months and provide less protection against the weather. Treat this with a wood stain, paint, or preserver. You can treat un-treated or dip-treated wood at any time.

How do you maintain exterior wood trim?

To maintain wooden trim and fascia, check them annually and perform minor maintenance as needed. Water exposure can cause wood to rot, so it’s crucial to do this diligently.

For a long-term solution, consider replacing wood trim with PVC trim, a plastic that won’t rot but can be cut, shaped, and painted like wood. This requires replacing all trim but requires minimal maintenance. Azek is a great brand for PVC trim.

Aluminum fascia wrap is a long-term solution for protecting your fascia from wear and tear. It comes in various colors and can be installed over your wood fascia. Although it takes time to install, it’s a good investment as it prevents moisture and bugs and doesn’t require painting.

Should you seal outdoor wood?

Natural wood is beautiful, but it needs to be sealed to maintain its beauty outdoors. Wood is porous, absorbing water, which can damage it over time. Sealing can extend the life of decks, fencing, and outdoor furniture, preventing replacements or repairs. Exterior wood sealers can also change the look of wood by waterproofing and protecting it from natural wear and tear. Wood stains can be used to stylize new wood or enhance the appearance of old wood, making it look new again.

Choosing a stain or stain and sealer combo can help prolong the look of a new paint or stain job. The color and transparency level of the stain or sealer depends on the wood’s age, appearance, and personal preference.

How do you protect exterior wood trim?

Wood trim should be repainted every 4-5 years to prevent damage. You can also choose aluminum coil wrap or replace it with cellular PVC. Exterior trim contractors can help. Fully Cellular PVC is a cost-effective option with a lifespan of 30-50 years and is limited to the manufacturer’s designs. It offers a lower-maintenance option and can be installed without the hassle of wood trim maintenance.

Do you use treated wood for exterior trim?

Pressure-treated wood may not be the best choice for exterior trim due to its poor paint holding ability, especially in southern yellow pine. It also has knots and defects, making it difficult to find clear boards. Premium grades of pressure-treated wood may be difficult to find, and the trim must be securely nailed or screwed to prevent warping and cracking. Despite its potential drawbacks, pressure-treated wood is a valuable option for exterior trim.