Here’s another wooden deck we built in Kloof, Durban which is similar to one we built in Hawaan Forest estate a few years ago. It has a fire pit with a U Shaped bench which double up as steps around it. These steps were designed so that they were wide enough to sit around the fire and with a riser that is not too steep to climb.
The substructure or frame was the normal H3 and H4 CCA Treated S5 pine we use. All our decks are built with an S5, H3 and H4 treated pine substructure. S5 refers to the grade of pine which is commonly called industrial grade. It is graded as such based on the number of knots per square metre. S5 is SABS industrial grade and has been passed by SABS to be used in construction. It doesn’t however make a very good deck board as there are too many knots which are not only unsightly but also they can become dislodged leaving a hole in the deck board. H3 and H4 CCA Treated refers to the hazard classification of the treatment as set out by The Wood Preservers Association of South Africa. Each H classification has a specific application and provided the correct H classified timber is used, the life span of the timber can be many more than 50 years.
The deck boards that went on top of the substructure were 19 x 68mm yellow balau deck boards. The other option for deck boards is 19 x 90mm yellow balau deck boards but they do carry a surcharge as they cost more per square metre than the 68mm wide boards.
There are two types of balau readily available in South Africa. Yellow balau and red balau. Yellow balau is more common and is superior to red balau. What we are seeing in South Africa nowadays which is called red balau is a lot more porous and softer and as such will absorb more water and rot more quickly. We only stock and use yellow balau.
This project in Kloof also included a pergola. What we have found to be most cost effective in pergolas is to use a 90 x 90 square balau post, 30 x 215 balau beam and 30 x 102 balau purlins or trusses at about 600 centres. This spec gives the pergola enough timber to be attractive and serve its purpose whilst still keeping costs down. With this particular job we also installed extra battens on top of the purlins. We used 30 x 40 balau for this purpose which again keeps costs down whilst still providing enough timber to keep it looking good and to do it’s job. Other options for battens on pergolas are to use a 30mm wide strip of balau with a 30mm or 60mm gap between. This provides more shade but of course comes with a higher price tag because more timber is being used.
The timber was sanded and sealed with an oil based sealer we use which doesn’t dry on the surface of the wood so it cannot peel and flake. Unlike other coatings which dry on the surface. These tend to peel and flake.
For a free no obligation quote on your wooden deck, pergola, balustrade and stairs requirements please contact us on 082 496 5444 or use the contact us form below.