Deck Planning

Planning is probably the most important issue to get right with decking to ensure good results.

When planning..

Select the location of your deck carefully, having regard for privacy and sun, shade or wind. Decks built in highly shaded positions will require more regular maintenance.
Consider the nature of exit and entry to the home. Keep the size of the deck in proportion to your home and garden.
For all but a simple, low level deck, property owners should satisfy themselves as to whether planning regulations apply to their proposed structure.
If unsure the property owner should always discuss their intentions with their neighbours and Local Authority planning office first.
Consider the end use of your deck when planning the sub-frame design. You may need commercial specifications for large groups of people.
Building Regulations require a deck 600mm (approx. 2 foot) or more off the ground to have a 1100mm high balustrade. However, you may also choose to incorporate one purely as a design feature

. . . when designing

Choose the direction you wish to lay the deck boards - this will establish joist direction. Deck boards with smaller cross sections need more joists and greater support.
When designing and building decks, always plan to achieve a free draining structure. For adequate water 'run off' decks should be laid on a slight gradient (at least 1 in 80). Note: lay grooved decking down the fall to enable water 'run off' and ensure the groove ends can drain freely, ie. pack out fascia if required.

Here are some typical deckboard patterns to consider:

Herringbone	Parallel	90^o or 45^o Chevron	Checkaboard

Laying deck boards in Checkaboard and Quadrant can hinder drainage and will require more regular maintenance.

If the deck is attached to a dwelling wall the finished deck height should not compromise the damp proof course (DPC). With 'old' houses it is advisable to keep the deck height at least two brick courses below DPC.

We recommend a maximum span between newel posts of 2100mm.

How many deck boards do I need?

The table opposite is the minimum quantity requirement. It is suggested that you add 10% to these figures to allow for cutting or patterned layouts.