Light organic solvent preservative (LOSP) is a waterproof timber treatment. LOSP may include synthetic pyrethroids, imidacloprid, azoles or copper naphthenates, which are all pesticides, but as it uses a solvent such as white spirit to contain the insecticides and fungicides, it is less hazardous than other timber treatments.

LOSP (Light Organic Solvent Preservative) LOSP is a pre-primed timber product. It is not intended for use where the treated commodity comes into contact with the soil. LOSP-treated timber is produced in a dry state in its final form, and usually not cut …

LOSP is a treatment that is usually a white spirit based solvent that contains copper naphthenates and synthetic pyrethroids as well as other chemicals to provide protection from insects and decay. How Does It Work? The timber is placed in a pressurised chamber with the LOSP solvent.

Discover LOSP treated timber, enhanced with white spirits-based fungicides and insecticides through controlled vacuum processes. Offering durability and resistance to decay without altering dimensions, LOSP is ideal for exterior cladding, fascia, trim, joinery, panelling, and other high-value building components.

WHAT IS LOSP TREATED TIMBER? LOSP stands for Light Organic Solvent Preservative and describes the carrier used to carry the preservation actives into the wood structure. The solvent used in LOSP can vary and includes low-odour formulations. After the wood product is treated it releases the solvent leaving the treatment actives behind in the wood

LOSP H3 is an effective preservative formulation designed to provide a lasting protection for timber products used in external situations above ground. The formulation contains specialised fungicides for protection against fungal decay and an insecticide to provide lasting protection from termites and other timber boring insects.

Light Organic Solvent Preservatives (LOSPs) are preservatives that contain insecticides for internal use, and combinations of fungicides and insecticides for external use, and sometimes water repellents. LOSPs may also contain mouldicides. All of these preservative components are incorporated in a solvent carrier such as white spirit.

LOSP-treated timber is suitable for painting with either acrylic or oil-based systems, and is most effective as a treatment when sealed. LOSP-treated timber is not suitable for in-ground use. LOSP treatments are mainly factory applied using a pressure and vacuum system, but solutions are available for painting as part of a maintenance program.

The complete range of Woodhouse Weatherproof® products are H3 LOSP (Light Organic Solvent Preservative) treated to be resistant against termite and fungal attack. The LOSP preservation process ensures the original dimensions and strength of each Weatherproof product are sustained through and following installation.

This data sheet covers Light Organic Solvent Preservative (LOSP) treated timber which may be used inside as a termite resistant material or outside above ground, in weather exposed applications, where protection