The flanges are made up from ultrasonically graded LVL15, making them the stiffest I joists available in New Zealand, bonded with exterior adhesive for more load bearing capacity.
The webs being Orientated Strand Board (OSB) are known for their superior strength and consistant performance.
Prolam I Joists are more uniform than solid sawn joists. They stay straighter and are manufactured with no camber, so there is no chance of crown down or upside down installation. They resist shrinking, twisting, warping and splitting for squeak resistant floors and quality roofs and ceilings.
Holes may be easily cut in the web according to the tables on page 22, allowing ducts and utilities to be run through the joists. Pre-punched 40 mm knockout holes are provided in the web for small diameter services or wiring.
Save Time and Money: Because they weigh less than solid sawn joists, Prolam I Joists are easier to install, saving construction time and cost. Their greater load carrying capacity allows you to space them further apart, so it takes fewer to build the average floor or roof. And with five (4) depths from 200 to 360, you will never have to compromise your design. So whether your plans call for cantilever beams in balconies, cathedral roofs or high pitched roof slopes, SmartJoists are the perfect choice.
An Environmentally Sound Choice: In addition to being cost effective, SmartJoists are also an environmentally sound choice because they are made of a renewable resource - wood. So they are a better choice for building.