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1.
For Raised Patio Decks 5.5m wide
Before starting erection of Deck
Please note that deck-boards may
be used grooved side upwards or the fine ribbed side upwards - depending on your
choice. The fine ribbed side has the better slip resistance and has been
graded as the top side. You will need to cut the 3m deck boards in
half and when laying the deck boards alternate the 4m & 1.5m deck boards.
A. Marking out position of deck
i. Choose
a site where the front to the deck will have the lowest step-up. The site can
slope downwards up to 600 mm. Balustrade should be used on falls of over
300mm. Mark out the perimeter with pegs and line. Check for squareness by
measuring for equal diagonals. Clear any obstructions that may interfere with
the deck or pergola - ground levelling is not required as the posts will be used
to level the deck.
ii. Mark
out where the Metal Post Anchors will be positioned, (see plan above)
(please read the Pergola assembly instructions first if fitting a pergola over
the raised deck- see note no. 4 below) - when in place they will
have their bolts facing to the front or back and
their outside edges will be approx 2.0m-2.2m apart - both ways and distances to outside
should be equal . Check for squareness of the post anchors by measuring for
equal diagonals.
B. Driving
Post Anchors into the ground, cutting and fixing Posts
i. Cut
a piece of post to use inside the Post Anchors when driving them into the
ground. With the Bolts facing the front or back
drive the Anchors into the ground continually checking and adjusting for
uprightness and squareness. Place Support Joist upright against the Post
Anchors running front to back raised off the ground approx. 30 mm at the front (use a board
laid flat) - level the joist and temporarily support at the back. Repeat
for Support Joist on the other side of the post. Repeat for the other Post
Anchors
ii. Cut the post so that there will be short
posts each coming in line with the top of the Support Joists from the base of
the Post Anchor. Make cuts with a slight fall from front to back.
Brush Preserver onto the cut surfaces of the Posts
iii. Fix
Posts into Post Anchors (where possible, ensure cut edge is at the top with the
fall from front to back to assist clearing rainwater).
Posts may require easing to fit the Post Anchors
-Brush Preserver onto the cut surfaces
-Check verticals & tighten the bolts on the Post Anchors to ensure good grip.
It is advisable to concrete in the Post Anchors after fixing all the
joists.
2. Fixing Support Joists to Posts
A. Select
the strongest joists with the fewest and smallest knots for use as the 4 main Support
Joists which are attached to the posts.
i. Ensure
that the first 2 Support Joists will be fixed to the Post which will be
on the highest ground. (i.e. the one where the Support Joist will be nearest the
ground and preferably the front entrance to the Deck). Place the first
Support Joist on the outside and second Support Joist on the inside of the
Posts running from front to back - so that there is an equal projection from
both Posts.
Position these first 2 Support Joists against first Post approx. 30 mm off the ground at
the front
- Use one of the 80mm screws to
locate the joists before drilling and use the Drill Bit provided to make a hole all the way through the
joists, the metal socket (if necessary) and the post - drill the hole 40 mm from the bottom of
the Support Joist and 10 mm offset from the centre of the post. Do not drill
the second hole into the same post yet because it is necessary to create the
levels with all the other Posts and Support Joists first. Temporarily fix both
Joists to the Post with a Bolt. It may be necessary to remove the first
joists and finish off the drilling through the second joists if the drill bit is
not quite long enough. This can happen if the posts and joists are not
square.
ii. Checking
that the level of the first 2 Support Joists are correct, position them against
the back (and centre where applicable) Post and drill, as (2Ai). You may not be drilling through the metal of
the Post Sockets if there is a slope.
iii.
Using one of the other timbers as a straight
edge align & level the next 2 Support Joists with first 2 Support Joists and
position against the second front Post matching projections and drilling as
(2Ai). Checking that the levels of these 2nd 2 Support Joists are
correct, position them against the 2nd set of posts Post and
drill as (2Ai). Check that the Joists attached to 1st set of Posts are level
with those attached to 2nd set of Posts. Adjust if necessary. Repeat for
3rd set of posts.
B. Drilling
a second hole in each post, Fixing the Washers and tightening the Bolts
i. When
all Support Joists are level - Drill a second hole 40mm from the top of the
Support Joists and 10 mm offset the other way from the centre of each post. Do
this for all Posts. You may not be drilling through the metal of the Post
Sockets for these upper holes - if you have this situation - Mark the Posts at
the top of the Joists. Remove all Bolts and the Support Joists from their
temporary fixings. Keep by the Posts. Position Washers where necessary, in
between the Posts and the Support Joists to compensate for the gaps created by
the Post Anchors, push all 8 Bolts through the Support Joists, Posts and Post
Sockets using a washer against the joist at the back before tightening the nut -
ensuring the washers have sunk a little into the joists.
C. Fixing Post Noggins
between Support Joists (this is only for the 3m & 3.6m decks)
i. Cut the post off-cuts into 2 No. approx. 90 mm cubes and
Brush Preserver onto the cut surfaces.
Position the post noggins in the centre
between and in line with the bottom of
the Support Joists.
Post Noggins are used to prevent distortion on the Support Joists and should not be
left out of all decks with 3m or 3.6m in positions C, D or E.
3. Fixing Outer & Centre Joists
A. Hanging Front & Rear Joist from Support
Joists
i. Position Front Joist against front of all 6 main support joists and ensure equal projections from both outside Support Joists.
Place 6 Joist Hangers so that they rest on top of all 6 Support Joists
i.e. open end pointing downwards with the back against Front Joist and when
correctly aligned - flush with the top of the Support Joists and with equal
projections - mark the positions on Front Joist where the 6 screws in each Hanger will be fixed.
Remove and fix the hangers to Front Joist using
the Small Screws. To give maximum strength the screws will be a tight fit and
may need ‘starting’ with a tap from a hammer. Place Front Joist over Support
Joists so that it rests on the Hangers - secure to all Support Joists
by screwing into the
timber on one side.
ii. Repeat for Rear Joist
B. Fixing the Side Joists to Front & Rear
Joists and Hanging the Centre Joists
i .Lay the Side Joists on the ground with the
inside face pointing upwards. Position the longer side of the Corner
Brackets on the Side Joists so that they are flush with the end and are 20 mm in
from the top & bottom. Use 3 of the Screws to fix each Corner Bracket to
the Side Joists. Ensure that the tops of all Joists are flush and fix the
Side Joists, using Small Screws, into each end of the Front & Rear Joists - this can be
flush (especially when joining two decks together) or, if a single deck, up to 60mm in
from each end to provide an overhang for the deck boards.
ii.
Mark the Front & Rear Joists (see guide above for distances) for the
remaining Centre Support
Joists. Position the remaining Hangers at the bottom of the Front & Rear
Joists centrally across each of the 2 marks with the open end pointing upwards,
so that the Centre Joists will later rest on the Hangers. Fix the
Hangers with the 6 Small Screws onto the Front & Rear Joists. Drop the
Centre Joist into place - and secure by screwing into the timber on one side.
C. Fixing Noggins
between Support Joists (only for C, D or E support joists over 3.6m)
i. Cut the 4" planed timber noggins to fit
between all joists in line with the centre posts (marked in green in the drawing
above) and
Brush Preserver onto the cut surfaces.
Position them in line with the bottom of
the Support Joists and fix with the 50mm screws screwing at an angle into the
support joists.
Noggins are used to prevent distortion on the Support Joists and should not be
left out.
D. Before fixing Balustrade and/ or
Deck Boards concrete around post sockets. Dig out approx. 300 mm deep and 400 mm
square around each post socket, recheck they are upright & square
with plumb rule or level and fill with concrete to prevent movement
4. If using pergola - click here
N.B. Always fix Pergola Posts, Supports, and Tops before
fixing Deck boards
5. If using Balustrade - click here Please
note that the newel posts must be fitted before the deck boards
6. Fixing the Deck Boards
-
please check from the list above as to how many deck boards are used and the
expected overhang.
i. Position the first deck board, with the correct overhang, and ensure it is flush at the
ends of the front joist. Screw in 2 decking screws in line
with each joists the front one going into the front joist.
ii. Space out the deck
boards so that the front of first deck board is 150mm from the front of the
second deck board this maybe 3mm to 7mm depending the moisture content of the deck boards and ensure flush at the ends
with the board in front. Screw in 2 decking screws
approx. 25mm from the front and back in line with each joists.
iii. The back board should overlap the back joists the recommended overhang (see
list above).
7. Finishing & Maintenance
i. As all timbers are pressure preserved further treatment is not necessary and the timber will
fade to a natural grey colour. If preferred, the deck may be coated with
Decking Stain to the colour of your choice.
If there is any build of moss, after winter use
a jet sprayer or
an anti-fungicidal and hose down to remove. To restore the
colour apply a further coat of Decking Stain.
ii. Dispose
of all waste timber in your dustbin - do not burn. Wash hands after handling
timber - especially before eating. Always wear safety glasses when using power
tools.
Help Line -
For more information - contact Peter Dale on
01457 855259 or email
diydeals@hotmail.co.uk
    
 
All rights reserved.
19/08/2010.
You may print this copy for use during erection. This leaflet may not be reproduced in whole or
in part without the prior written approval of Peter Dale.
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