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Patio Deck with Pergola project - step by step

An old conservatory demolished, leaves room to cover the old base with a purpose built deck and timber pergola. The straightforward deck sub frame is constructed and once it has been built and the levels correct, then it is concreted into the ground.

The main support posts for the deck, are also the supports for the timber pergola over the top of the decking area. The back plate for the pergola was bolted into the house with 12mm sleeve anchor bolts.

We take you through the project of building this patio deck with pergola.

Step by Step Decking Construction Project. Build your Own.

Monday 13th Feb 2006 Day 1 -  Phil decides to cast a spell on the deck area!!! 

Old concrete Patio before deck and pergola constructedThe new deck was to cover the old base of a decrepit conservatory - removed by the client.

There was enough room between the old concrete base and the door sill to be able to use the standard decking joists - 6 x 2in (150 x 50mm) tanalised timber. Obtainable as standard supply at any builder's merchant or timber supplier.

The wall plate - a 6 x 2in joist, would fit under the door threshold - bringing the  finished deck to near the same level as the door frame. As this was near to DPC level, spacer washers were placed behind the wall plate to ensure a gap of 1cm between deck and house wall.



It didn't work, so the guv'nor gets to work instead!!

Decking joist fitted with joist hangers. this will be the base plate bolted into the house wallBefore fixing the wall plate to the wall, galvanised joist hangers are fixed - at 600mm centres to take the decking joists, which will be fixed going a way from the house. The deck boards will therefore run parallel to the house.

This is the easiest way to build a small - or large - ground level decking sub frame. The 'joist hangered' wall plate is bolted through to the wall using 12mm sleeve anchors, and the use of 50m sq galvanised plate washers instead of normal small circular washers.

Once the decking wall plate is fixed to the wall - perfectly level in this case, then you simply have to slide the joists into the joist hangers, running out from the deck. At this stage, simply fix each joist to the hanger by using a single galvanised nail.

Once the joists are fixed on a temporary basis,  they can be cut to required length. Alternatively they can be cut to desired length prior to fixing. Do not forget to allow for the thickness of the wall plate and also the thickness of the end plate (joist) In this case, it is a combined thickness of 94mm. Whilst we talk of 50mm wide joists, they are in actual measurement normally 47mm wide.(Having been machined from a 50mm wide raw timber! Likewise with the depth, which will not be 150mm but nearer to 145mm.


Phil can't believe his eyes, and tries to figure out how the subframe 'materialised'!


The sub deck frame for the small deck finished showing joist arrangement

This image shows the finished deckframe supported with temporary supports whicls proper levelling takes place. Once the frame is level and packed to ensure no movements, then the supports can be fixed and concreted into the ground in the correct places.

In this instance the pergola upright supports also serve as part support for the deck - concreted into the ground - just a 6in deep, and bolted to the deck frame. If doing this, then either accurately measure your distances to ensure no undue cutting in of deckboards, or as in this instance, lay the decking right up to where the upright pergola supports are to be fixed, and then fix the posts to deck. This will ensure that you only have to notch-cut a single deckboard.


Deck done - posts concreted for pergola - all nice and tidy until tomorrow!


Deck finished with the uprights ready to take the pergola beams

This image of the deck which has now been laid can be clicked for enlargement.

The decking has been laid, the posts have been concreted. All that remains now is for the pergola to have a head, and the deck to have it's fascia.



Tune in tomorrow evening for the next gripping instalment!


Day 2 - Job done!!


Small timber deck and pergola finished - ready for the clean-upImage can be clicked for enlargement.

The wall plate for the pergola was fixed in the same way as the decking wall plate. Joist hangers fixed first, then bolted through to the house wall with sleeve anchors. The bearer for the pergola rafters (beams) was fixed to the upright supports by use of 12mm galvanised bolts. Getting the bearer in place is a simple matter. Just measure the distance from ground to 'bottom' of wall plate, then mark that on the pergola upright, clamp the bearer into correct position and then fix as above.

It is a relatively simple matter to then place the pergola rafters into the joist hangers and resting on to the fixed bearer.  The same timber that was used for the base of the deck - 6x2in, has been used for the pergola construction - with a little bit of shaping at the ends.


Phil Cast his eye.


Phil inspects the deck for level


With the pergola now completed, it is just a matter of fixing the fascia boards (deck boards) to the exposed edges of the deck. They can either be butt jointed at the corners, or mitred in a 45 degrees. Simple butt jointing is fin, quicker, and does not have the potential for damage as does the mitred corners.




Guv'nor tries to get closer to the blue sky, which he hasn't seen for a month or so (it seems)


Not the cleverest way to stand on a pair of steps. However the beams of the pergola give support - much needed

Few odds and ends sorted - then a quick tidy-up!

This IS NOT the cleverest way to stand on a pair of unsupported steps. The boss gave himself a good ticking off over his own stupidity!

However, all the pergola rafters are now nailed into place and pergola is well

supported by the concreting and bolting through to the deck frame.



   Finished small patio deck with pergola and child step in place   Detail of the pergola beams resting on main support bearer.

Nice one you guys!  Job Done. 


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