Quick answer
Clean the surface appropriately, then inspect the wood after it is dry. The key distinction is surface growth versus loss of wood strength.
What to check first
Start with observable conditions before choosing a repair method. These checks help separate a surface symptom from the problem that actually needs attention.
- Where growth is concentrated—under trees, near planters, along shaded edges, or by poor drainage.
- Whether boards feel firm after cleaning and drying.
- Raised fibers, deep checking, splintering, or soft spots separate from surface discoloration.
- Water sources such as roof runoff, clogged gutters, irrigation, or poor air circulation.
- Coating condition and whether the deck can dry between wet periods.
Why these details change the repair
A good repair plan should address cause, access, safety and finish—not merely the most visible defect. For this topic, the following details can materially change the scope:
- Excessive pressure can scar wood and force water into places it should not go.
- A cleaning chemical must be compatible with the deck material, surrounding plants, and finishes.
- Persistent dampness can contribute to coating failure and eventually decay.
- Traction matters: algae can be a safety concern even when the structure is sound.
A practical way to handle it
When to turn the question into a service call
If you know the symptom but do not want to spend your time diagnosing, sourcing materials, setting up tools, or making several repair attempts, send the job to Bentonville Handyman Co. The most useful request includes the room or exterior location, what is happening, approximate quantity or size, and whether the condition is changing.
Use the short request form, call, or go directly to the related Bentonville Handyman Co service page.
Common questions
FAQ
Does green algae mean I need a new deck?
No. Surface growth alone is not a replacement criterion.
Can pressure washing damage a deck?
Yes. Excessive pressure or poor technique can gouge wood and damage finishes.
Should repairs happen before or after cleaning?
Unsafe components should be addressed promptly. Cleaning can also make some surface defects easier to see, but do not use an unsafe deck just to clean it.