Derrinabrin Farm, Norwood Hill Road, Charlwood, Surrey,RH6 0EB, UK
INITIAL HINTS AND TIPS FOR INSTALLING HARMONY DECKING
IMPORTANT NOTE:
When designing your deck please make note of the joist spacing in your frame. Composite wood behaves differently
to traditional timber, hence for different spacings that you may be used to.
1. Lay your Joists 350mm centre to centre, running the
opposite way to the direction of the Deck Boards.
Make sure to leave a 20mm gap between your walls /
fence to allow for expansion.
2. Pre-drill and screw the Joists to your concrete base.
(If using Composite Joists pre-drill & over-drill holes
to allow for expansion. Use of expansion screws are
recommended). See Figure A.
3. Fix Starter Clips along the edge of each Joists at the
end you wish to start laying boards from. Pre-drill the
screw holes & screw in place. See Figure B.
4. Push your rst board into place, clipping into the Starter
Clips
5. Clip Concealed Fixing Clips into the rst board along
each of the Joists. Pre-drill and screw in place. See
Figure C. Space between boards should be 5mm.
6. If joining 2 lengths of board together, make sure both
ends are supported by separate Joists. Leave a gap
calculated on the expansion rate of 0.3%-0.5% of the
board length to allow for expansion. See Figure D.
7. Push the next board in place. Repeat until your deck is
the required length.
8. Measure out the width of the last board and mark Joists
ready for Starter Clips to nish the deck. Pre-drill the
holes and screw Starter Clips in place.
9. Clip your last board into the
previous board and push
down into place using a
rubber mallet if required.
See Figure F.
Overhang
Overhang of boards from joist
should not exceed 20mm.
Finishing L Trim For
Non Step / Non Walking Edge
Lay your nal joist with a 20mm
over hang to allow for expansion.
Screw the 90° angle directly into
the joist. If for a walkway or
doorway, use an aluminium L
shaped cover from your local DIY
store to hide the gap.
Figure F
Figure E
