I have a large flat area[3.9m x 4.8m] of standard decking which has
patches of rotten boards. The underframe is still in good condition and structurally sound.

This decking is totally covered with good quality artificial grass

Rather than repair the bad boards, would it be acceptable to cover the
bare decking with sheets of plywood or OSB and re-lay the grass?

Regards

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newman <[email protected]> wrote:

I have a large flat area[3.9m x 4.8m] of standard decking which has
patches of rotten boards. The underframe is still in good condition and structurally sound.

This decking is totally covered with good quality artificial grass

Rather than repair the bad boards, would it be acceptable to cover the
bare decking with sheets of plywood or OSB and re-lay the grass?

Regards

Depends on how many boards are rotten it might work out dearer using OSB or
ply rather than simply replacing the boards. OSB even though fairly
resilient to water will expand if continually wet and even expensive marine
ply will need sealing which decking oils do not do.

Richard

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On 10/07/2025 16:27, newman wrote:

I have a large flat area[3.9m x 4.8m] of standard decking which has
patches of rotten boards. The underframe is still in good condition and structurally sound.

This decking is totally covered with good quality artificial grass

Rather than repair the bad boards, would it be acceptable to cover the
bare decking with sheets of plywood or OSB and re-lay the grass?

Regards

You may need to think about water run-off. The 'grass' is presumably not impermeable and also holds some water? That would be why the boards have rotted. If you put sheet material down and it rains - then what?
pooling? permanently wet all winter?

How about : Replace the rotten boards, cover with some kind of plastic grid/mesh for ventilation, replace the astroturf.

It sounds horrible.

TW

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On 11/07/2025 10:09, Tricky Dicky wrote:

Depends on how many boards are rotten it might work out dearer using OSB or ply rather than simply replacing the boards. OSB even though fairly
resilient to water will expand if continually wet and even expensive marine ply will need sealing which decking oils do not do.

I used two pieces (200 x 100cm) of marine ply to cover a 400cm long log
storage area outside. Each piece was covered in two coats of external
varnish and three coats of external paint. After a few years, one piece
started to show wet stains underneath and went mouldy after another
couple of years. The other piece is still fine.

--
Jeff

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On 10/07/2025 16:27, newman wrote:

I have a large flat area[3.9m x 4.8m] of standard decking which has
patches of rotten boards. The underframe is still in good condition and structurally sound.

This decking is totally covered with good quality artificial grass

Rather than repair the bad boards, would it be acceptable to cover the
bare decking with sheets of plywood or OSB and re-lay the grass?

Regards

Are you considering removing the rotted decking planks?

Could you be in danger of trapping moisture between the old decking and
the new decking boards especially in areas that have already rotted.

Depending maybe on the type of rot it may be a good idea to treat the
old decking to kill any rot spores that may immediately start attacking
your new "wood" covering.

--
mailto : news {at} admac {dot} myzen {dot} co {dot} uk

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On 12/07/2025 09:49, alan_m wrote:

On 10/07/2025 16:27, newman wrote:

I have a large flat area[3.9m x 4.8m] of standard decking which has
patches of rotten boards. The underframe is still in good condition
and structurally sound.

This decking is totally covered with good quality artificial grass

Rather than repair the bad boards, would it be acceptable to cover the
bare decking with sheets of plywood or OSB and re-lay the grass?

Regards

Are you considering removing the rotted decking planks?

Could you be in danger of trapping moisture between the old decking and
the new decking boards especially in areas that have already rotted.

Depending maybe on the type of rot it may be a good idea to treat the
old decking to kill any rot spores that may immediately start attacking
your new "wood" covering.

Thanks

I am looking at various options and their advantages and disadvantages.

I replaced some bad boards about 5 years ago, but even more have now
rotted.

The options look like

1 Complete re-boarding.
Expensive and messy.

2 Some sort of covering and relaying the grass.
Cheap and easy and can be done in stages.
May lead to more problems down the line

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newman wrote:

I replaced some bad boards about 5 years ago, but even more have now
rotted.

The options look like

1 Complete re-boarding.
Expensive and messy.

2 Some sort of covering and relaying the grass.
Cheap and easy and can be done in stages.
May lead to more problems down the line

Might the grass covering the boards be the cause of the rot? e.g. boards
in constant contact with a source of damp?

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On 12/07/2025 23:48, Andy Burns wrote:

newman wrote:

I replaced some bad boards about 5 years ago, but even more have now
rotted.

The options look like

1 Complete re-boarding.
Expensive and messy.

2 Some sort of covering and relaying the grass.
Cheap and easy and can be done in stages.
May lead to more problems down the line

Might the grass covering the boards be the cause of the rot? e.g. boards
in constant contact with a source of damp?

Some of the boards had already been replaced before the grass was laid.
It may have hastened the rotting.

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