Losp Timber


Softwoods stock a huge range of LOSP timber. LOSP, or Light Organic Solvent Preservative is a form of treatment that offers similar resistance to weathering and termites as CCA treated pine, using a lower impact preservative.

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Most of the LOSP timber that we stock is easily identifiable as it is coated with a blue primer and is machined to an exceptionally smooth and flawless finish. We stock Design Pine from ITI in a wide range of sizes. Our LOSP timber is all plantation grown and is both environmentally friendly and 100% sustainable.

The process for making such precisely machined timbers is complicated and involves removing any natural defects from the timber. To do this, the lengths of timber require cutting, so once the defects have been removed, lengths of timber are then finger joined and glued back together to form a perfectly straight defect free product. This has the benefit of ensuring that there will be no leeching of sap or resin through the primer or paint for the life of the product, and that the boards are far less likely to bow as they are generally made up of a few shorter lengths.

The glue and finger joining on these boards has approval for use up to Service Class 3 standards, which allow for its use outdoors and uncovered. Further to this approval, the blue primer used on LOSP timber acts as a UV resistant layer and a great undercoat, so no preparation is needed for painting and a top coat can be immediately applied for an excellent finish. This primer is occasionally subject to degradation when exposed to weather, so it is wise to check it’s condition before directly painting it.

LOSP timber is used in a lot of outdoor applications, we use it primarily in Pergolas as it’s smooth finish make for a great clean looking structure. As it is slightly more expensive than CCA treated pine we tend to recommend the use of CCA in non-appearance situations such as for the sub flooring of decking. LOSP is also suitable for high contact use as per the APVMA guidelines as it’s preservative has no heavy metals and won’t leech.

When working with LOSP timber it’s recommended that you spray cut ends with a suitable sealant, to preserve the integrity of the primer and make sure that there is no uneven uptake of moisture into the timber. Despite this LOSP is treated to H3 levels and the preservative contains waxes and resins that slow the uptake of any moisture, so this is largely precautionary advice.

If you’d like to inquire about our stock, or you’d like to order some of our LOSP range, either contact us, or come in and have a look for yourself!

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Croydon, SA

573 Port Road
West Croydon SA 5008
Corner Rosetta Street

(08) 8346 1499

Modbury, SA

493 Wright Rd
Modbury SA 5092
Corner Wright & McIntyre Roads

(08) 8396 4044

Lonsdale, SA

28 O'Sullivan Beach Road
Lonsdale SA 5160
Corner Dyson Road

(08) 8384 5133

Perth, WA

Suite 15 Plaistowe Mews
102 Railway Street
West Perth WA 6005

1300 737 465