Timber & Builders Merchants, Swansea, South Wales
01792 - 462346

How To? Info

How to construct a 1.8 metre  high (3 rail) vertical featheredge fence.

Materials required


100x100  (4”x 4“)  treated posts

or  75 x 75  (3”x 3”)  treated posts

2.4mts long. Can either be sawn (rough) or planed (smooth). Must be treated stock suitable for in ground applications. Posts should not be more than 1.8mts apart.


38 x 100 (11/2 x 4)  treated rails

Can either be sawn (rough) or planed (smooth).
Must be  treated stock suitable for exterior use. 3.6mts  lengths will span 3 fence posts.


ex 25 x 150  (1x6) tapered featheredge fence boards. Overlap featheredge 25mm minimum

Can either be sawn (rough) or planed (smooth).
Must be of stock suitable for exterior use. Featheredge boards should not touch the ground.


100mm (4") galvanized nails

To fix the rails to the posts


40mm (1 1/2") galvanized flat head nails

To fix the featheredge to the rails


Concrete As Required

To concrete the posts into the ground


Installing the Fence Posts:

(1) Determine the fence line and mark it out with a string line. Continue the string line 600mm past each end of the fence line and tie each end to stakes hammered into the ground. Make sure the string line is taut and not in contact with the ground at any place.

(2) Push two small stakes into the ground marking the centre position of the two end posts.

(3) Next, peg the position of the intermediate posts along the string line, ensuring all pegs are equal distant apart and not exceeding 1.8 metres. Offset all pegs 50mm in from the string line. This is to establish the centre of the post, as the posts are 100mm wide.

Important! Adjust measurement if using 75mm posts.

(4) Remove the string line and dig the post holes, 250mm square x  450mm to 600mm deep depending on ground conditions. The pegs mark the centres of the post holes.

(5) When all holes are dug and cleaned out, replace the string line to its original position, checking the string line is not touching the ground at any place.

(6) Make a mix of concrete at a ratio of 3 gravel, 2 sand and 1 cement. Add clean water and mix to a uniform consistency until wet enough to fill around the posts, yet stiff enough to hold the posts upright without the need of supports or braces. Of course you will need a wind free day. Carefully shovel 100mm of concrete into the bottom of every hole.

(7) Starting at one end, commence putting the posts in the holes. Using a plumb level against two adjacent sides, check that each post is plumb (vertical),
and almost, but not quite, touching the string line.

(8) Fill hole with concrete to within 50mm of ground level. Check again the post is plumb and not quite touching the string line. Because of the depth of the hole, the concrete should support the post without the need for bracing, but not on a very windy day. Continue until all posts are concreted in.

This method saves a lot of time and timber without the need for bracing each post, check the posts again for plumb (vertical) and that they are not touching (but close to) the string line. Leave posts set!


Fixing the rails and featheredge


Fixing the Fence Rails:

Fix a string line to both of the end posts 1750mm above ground, and mark all the intermediate posts along the string line.

Trim the top of the posts at the height marks.

Nail the top rail flat on top of the posts. One rail should span two sections (3 posts).

Cut, fit and nail the middle and bottom rail in between the posts so that the underside of the bottom rail is 1550mm down from the top of the post, about 200mm off the ground and the middle rail is central between top and bottom rail.


Fixing the Featheredge:

Fix the first board at the start of the fence line with the top of the board 50mm above the top rail. The bottom of the board should also be 50mm from the ground. Use a plumb level to ensure the board is plumb (vertical) and nail in place using 40mm (1 1/2") galvanized flathead nails, 2 at each rail.

Continue by placing another board overlapping the first as shown above (no more than 40mm no less than 25mm) and just below the string line.

Nail in place and repeat that action until all boards are in place.

Check, as you are going, about every 10th board with a plumb level for plumb (vertical), and make any necessary adjustments. Ensure the tops of the palings do not touch the string line. keep approx 3mm below. This can be done by eye.

Illustrates: Each Section Of Your Finished Fence.



TEL: 01792 462346

Email : hancockandbrown@hotmail.co.uk