Aberdeen Decking Blog

Step by step decking

By Simon Elms 9 January 07

The basic principle of constructing a deck is to attach the decking boards to a timber frame that consists of horizontal joists attached to vertical posts. It’s always advisable to consult a professional when undertaking a major building project. However, here’s a guide for constructing a small decking area.

1. Measure out the area the deck will cover and work out where the posts will go. A deck should be supported by posts on all corners and every 1.5m (5ft) around the perimeter, although more posts are required if the deck will be supporting heavy loads.

2. Dig holes 300mm to 400mm (12in to 15in) deep and 300mm (12in) wide for the posts. Put a building block in the bottom of each hole and place the post on top of this. Use a spirit level to make sure the posts are upright, then fill the holes with concrete. You must wait for the concrete to harden before continuing with construction, which should take one to two days.

3. Using bolts, attach the joists to the outside of the posts at the desired height to form the outside edge of the frame. Leave the posts long, as you can attach rope later to form a banister.

4. Attach joists to the inside of the frame every 300mm to 450mm (12in to 15in), using either joist hangers or screws.

5. To improve the stability and prevent any sideways movement from the deck, add shorter lengths of wood (150mm x 50mm/6in x 2in) every one to two metres (4ft to 6ft), perpendicular to the inside of the joists.

6. Screw the decking boards to the joists, leaving a gap of 6mm to 10mm between each board. This will allow the boards room to expand during wet periods. It will also ensure sufficient drainage and ventilation. If using hardwood, drill the holes in advance. Decking boards are usually laid at 90 or 45 degrees to the joists. Always lay decking when the boards are dry.

7. Once the decking boards are attached, use string to form a straight line along the edges of the deck and saw them all off in one go. Allow the boards an overlap of about 5cm (2in) over the frame. Paint the cut ends with a sealant to prevent water penetrating the deck.

8. Paint the deck with a coloured deck stain if required and coat with a clear water repellent.

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