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Tommy Walsh's DIY Guide
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Tommy Walsh's DIY Guide (2001)(Empire).iso
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t2h.txt
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1998-10-14
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Summary
The following topics contain information about formwork
and contraction units:
1 Using timber or steel
2 Inserting the formwork
3 Checking the lengthways fall
4 Inserting the other sides
5 Checking the crossfall
6 Setting the bay length
7 Positioning the filler strip
8 Removing the hardboard filler
Tools
Claw hammer, lump hammer, saw, spirit level
Materials
Nails, timber, pegs.
Step 1 - Using timber or steel
If the task you are performing is a one-off, there may be
little point in using wood for your formwork. Hire companies'
usually stock rigid and flexible forms which use steel pegs
for support. They also come with connecting strips and wedges.
Sizes vary between 100mm to 250mm (10 inches)
Step 2 - Inserting the formwork
Ensure the sub-base is thoroughly prepared. Line up a piece of
timber (or the hired steel form) cut to the appropriate length
to form the first side of the formwork. This should protrude
to the same level as your pegÆs mark for the surface level.
If necessary remove some hardcore.
Step 3 - Checking the lengthways fall
Using the spirit level check the fall lengthways is correct to
the calculations you made when preparing the sub-base.
Then nail the timber to the pegs.
Step 4 - Inserting the other sides
Attach the next piece of formwork at right angles ensuring
it is level with the first piece.
Step 5 - Checking the crossfall
Ensure the crossfall you have chosen is correct using a spirit
level. Nail the timber to the pegs. Repeat the process with the
subsequent timber pieces together to make up the rest of the
formwork.
Step 6 - Setting the bay length
For paths and drives remember to work out if you will need any
bays based on the width and depth of the concrete.
Step 7 - Positioning a filler strip
Position a piece of hardboard as your filler strip. So it is
at right angles with the formwork, bend it if necessary. You
can then add support to it using more of the timber edging and
fixing with wooden pegs. Remove the timber support before
filling the next bay.
Step 8 - Removing the hardboard filler
When you have filled both bays you can use an arrising tool
on both sides of the board and remove.