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Be aware when purchasing treated timber, it may seem treated externally, however when you cut it, not all treated timber is what it may seem, here are images of my C24 class 4 ground contact treated timber, which should have been good for 15 years!!This is 6" x 2" C24 graded timber, treated with class 4 ground contact, it turns out to be Spruce timber, which is non receptive to ingress penetration, at best all you will ever get is an envelope covering.This is 4" x 4" C24 graded timber treated with class 4 ground contact, and is heartwood, (from the centre of the tree) and heartwood is very very poor at ingress penetration of chemical treatments.
Be aware when purchasing treated timber, it may seem treated externally, however when you cut it, not all treated timber is what it may seem, here are images of my C24 class 4 ground contact treated timber, which should have been good for 15 years!!
This is 6" x 2" C24 graded timber, treated with class 4 ground contact, it turns out to be Spruce timber, which is non receptive to ingress penetration, at best all you will ever get is an envelope covering.
This is 4" x 4" C24 graded timber treated with class 4 ground contact, and is heartwood, (from the centre of the tree) and heartwood is very very poor at ingress penetration of chemical treatments.
