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#1
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Laying wood on the earth in a greenhouse
In article ,
Martin wrote: Marine ply is very uncommon - they are likely to be either one of the ordinary internal grade ply or WBP (water-boil-proof) which is OK for external applications. But not standing on damp soil! Depending on lots of things, the soil underneath such a greenhouse might or might not be dry enough. Outdoor quality/WBP ply lasted 15 years without delaminating when used as bottom boards in a Wayfarer dinghy. Most of the time the boards were wet. The ply had a 20 year guarantee. Damp soil is actually a MUCH more demanding environment! It's the bioactivity that causes the damage, and most of the relevant fungi can't tolerate seawater, so the main decomposition there is chemical. Regards, Nick Maclaren. |
#2
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Laying wood on the earth in a greenhouse
In article ,
Martin wrote: Marine ply is very uncommon - they are likely to be either one of the ordinary internal grade ply or WBP (water-boil-proof) which is OK for external applications. But not standing on damp soil! Depending on lots of things, the soil underneath such a greenhouse might or might not be dry enough. Outdoor quality/WBP ply lasted 15 years without delaminating when used as bottom boards in a Wayfarer dinghy. Most of the time the boards were wet. The ply had a 20 year guarantee. Damp soil is actually a MUCH more demanding environment! It's the bioactivity that causes the damage, and most of the relevant fungi can't tolerate seawater, so the main decomposition there is chemical. The boat was afloat 12 months of the year in fresh water. Ah. That's still less demanding than the top 6" of soil, though. Regards, Nick Maclaren. |
#3
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Laying wood on the earth in a greenhouse
In article ,
Martin wrote: Marine ply is very uncommon - they are likely to be either one of the ordinary internal grade ply or WBP (water-boil-proof) which is OK for external applications. But not standing on damp soil! Depending on lots of things, the soil underneath such a greenhouse might or might not be dry enough. Outdoor quality/WBP ply lasted 15 years without delaminating when used as bottom boards in a Wayfarer dinghy. Most of the time the boards were wet. The ply had a 20 year guarantee. Damp soil is actually a MUCH more demanding environment! It's the bioactivity that causes the damage, and most of the relevant fungi can't tolerate seawater, so the main decomposition there is chemical. The boat was afloat 12 months of the year in fresh water. Ah. That's still less demanding than the top 6" of soil, though. Did you ever see the part of wooden piles near the surface after they have been in water for 15 years and that's without Teredo navalis. OK they need salt water but ... :-) Yes. The facts are as I stated. Regards, Nick Maclaren. |
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