It is not uncommon for the so-called carcassing timbers to arrive on site in a damp or even wet condition from the timber merchant for indeed most carcass timbers are not stored under cover. Such timber should be returned to the merchant for dry stock. If the builder has to accept wet timber, he must immediately take steps to achieve as much drying out as possible, before building the timber or components into his house.

Structural timbers such as rafters, purlins, ceiling ties, floor joists, etc., will often be delivered strapped with steel or nylon banks in house sets and may will be offloaded by a lorry mounted crane or fork-lift truck. If the timber is at all damp then the straps should be split immediately, the timber inspected for quality and the consignment checked against the delivery note and the cutting schedule for the timbers required. Any shortages should then immediately be notified and rectified before construction starts.

The timber should be restacked on sets of bearers ideally 150 mm minimum off the ground and with thin sticks placed vertically in line with the bearers between each layer of timber to facilitate rapid drying. Any subsequent packs of timber placed on top of this stack should have their bearers again directly in line with the bearers of the pack below to avoid distortion of the timber, which could result in difficulties in fixing and certainly in poor quality in the completed building. Figure 8.1 illustrates a poorly stacked set of timber.

Fig. 8.1 Timber stacking.

Was this article helpful?

0 0

Post a comment