Can You Use Non-Pressure Treated Wood Outside?

When transforming your private home by including outside dwelling area, it’s essential select the perfect supplies for the job. On the subject of high-performance woods, pressure-treated wooden is the usual for decks, patios and gardens.

This particular constructing materials is handled with a preservative that offers it a protracted service life regardless of the results of the climate and heavy use. Most outside buildings use pressure-treated wooden to maintain out pests, mould, and water harm.

You may’t use pressure-treated wooden exterior, however it’s essential take steps to make sure it lasts. These preventative measures embrace making use of sealers, weatherproof paints, and outdoor-friendly stains. In any other case, non-pressure handled lumber might not final as lengthy and you could be changing the inspiration before anticipated. Untreated wooden is advisable for inside buildings and furnishings.

Earlier than you resolve whether or not to make use of non-pressure-treated or pressure-treated lumber, let’s undergo the specifics of every materials.

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What’s strain handled wooden?

Because the title suggests, strain handled wooden is wooden that has been handled with numerous finishes and substances. Non-pressure handled wooden has not undergone any particular remedies and stays “pure”.

These remedies make the wooden extra proof against dangers similar to water harm, rot, mould and pest infestation.

What’s strain therapy?

Strain therapy begins with pure lumber. A machine makes use of a strain system to inject chemical substances into the wooden, which extracts as a lot air from the wooden as doable.

The kind of chemical substances used and the strain used will range. The wooden is dried earlier than it’s shipped.

Chemical compounds used

  • Quaternary Alkaline Copper (ACQ): This chemical helps wooden resist harm from UV gentle. Additionally it is useful towards pests and mould.
  • Micronized copper azole (MCA) and copper azole (CA): These preservatives are used for his or her water resistance and pest repellent properties.
  • Chromated copper arsenate (CCA): This mix is a excessive efficiency answer authorized for marine building.

Frequent functions for strain handled wooden

  • deck fences and flooring coverings
  • retaining partitions
  • backyard beds
  • Any construction touching concrete or masonry

Frequent issues when utilizing non-pressure handled wooden outside

There are normal dangers you run when utilizing any sort of wooden outside. What occurs when you use untreated wooden outside?

harm from daylight

Ultraviolet rays not solely harm the wooden, but in addition all the colours and stains in your wooden. Extreme warmth may cause wooden to develop and warp.

water harm

If water comes into contact along with your wooden, it may weaken the adhesive and trigger the wooden to crumble. Mildew can develop or rot can unfold.

pest or mould harm

Termites and ants are frequent outside invaders. Mildew can also be frequent.


Numerous circumstances may cause wooden to crack. Daylight, excessive chilly, and extreme humidity are a few of the culprits.

Professionals and cons of utilizing strain handled wooden

Benefits of pressure-treated wooden

  • life span: Strain handled wooden can last as long as 40 years outside. Nevertheless, when used as a terrace masking, the service life will be lowered to 10 years.
  • Resistance to water harm: One of many fundamental causes for utilizing strain handled wooden is its water resistance. Wooden therapy varies in effectiveness, from easy to marine grade. This score impacts how properly it stands as much as the climate and utilization.
  • Comparatively low value: Strain-treated lumber prices about $15 to $25 per sq. foot. The fee will depend on the kind of wooden used and the therapy utilized.

Strain Handled Wooden Cons

  • Not so sturdy towards daylight: Strain-treated wooden is delicate to sturdy daylight. You could have to dampen your patio in the course of the hotter months to reduce solar harm. Unprotected wooden might fade and/or crack.
  • Handled with chemical substances: Because of this, non-pressure-treated wooden is advisable for surfaces that you could be contact, similar to indoor furnishings or flooring.
  • Warping is frequent: The chemical substances in pressure-treated wooden contribute moisture to the wooden. This will trigger warping because the drying time is lengthy – no less than 72 hours to 6 months. Fight this drawback by permitting the components to dry earlier than sealing.

Kinds of strain handled wooden

The American Wooden Safety Affiliation (AWPA) categorizes pressure-treated wooden into 5 fundamental classes.


This class is used for foundations or buildings which can be involved with water. It’s generally used for decks, fences and posts. It’s suitable with common climate circumstances.


This class is used for important buildings involved with contemporary water. Frequent functions embrace picket foundations, utility poles and tree branches. It’s appropriate for any climate.


This class is taken into account excellent for parts that come into contact with soil or contemporary water. It’s used for land piles, foundations and energy poles. It’s excellent for areas liable to rot.


This class is good for marine environments with salt water. It’s usually used for bulkheads, pilings and struts.


That is essentially the most sturdy class appropriate for steady saltwater publicity. It’s excellent for bulkheads, bracing and piling.

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associated questions

How do I seal non-pressure handled wooden for outside dwelling?

Step 1: Take a look at the water.

Spray water over your wooden to see if it is dry. If absorbed inside 10 minutes, the wooden is prepared for staining or portray.

Step 2: Wash the wooden.

In case your patio has been outside, take away mould, filth, and different particles. Repeat step 1.

Step 3: Take a look at a patch.

Apply a small quantity of stain to an space to preview the impact.

Step 4: Stain your entire flooring/construction.

Comply with your stain producer’s directions for correct utility. Select UV protecting formulation for the perfect outcomes.

Are you able to construct a deck out of non-pressure handled wooden?

You may construct a yard patio out of non-pressure handled lumber. Nevertheless, you could seal and deal with it your self to extend its life.

When do I exploit non-pressure-treated wooden?

Use non-pressure handled wooden for indoor flooring and furnishings. You and your loved ones are more likely to contact these surfaces, and handled wooden will be unsafe when used indoors. This is applicable particularly to surfaces that come into contact with meals.

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