LOSP - How are Light Organic Solvent Preservatives applied?

LOSPs are impregnated into the timber, generally in its final shape and form, by sophisticated vacuum pressure treatment plants running computer-controlled treatment cycles. The exact preservative penetration and retention requirements are set out in the AS/NZS 1604 Standard series. It is preferable that the integrity of this preservative treatment should not be breached, e.g. by machining, drilling, and cutting on site. If this is unavoidable, it is essential that some form of brush-on treatment be applied to the newly exposed cut surfaces (see also the following section on post-treatment care).