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Martin's Blog 11/07/11 - DrivetimeIf there’s one aspect of building work that always
seems to be linked to cowboys, its driveways. There
are of course, many professional firms who will resurface your driveway
properly, but if you’re up to hard graft, it is a project that a keen DIYer
could undertake. Drainage Check if the drive will interfere with existing
drainage channels. The Government’s Sustainable Urban Drainage System (SUDS)
means you must effectively manage any surface water run-off. Get plastic
gullies and channels designed to take water away from driveways and incorporate
into the project. If your driveway is long, it should be cambered (higher in
the centre than the edges) like a road. Firm Ground Your driveway will have your car(s) parked on it
for long periods so having good foundations is vital. The first thing to suss
out is how firm the ground is underfoot. Dig a hole and drive a 50mm x 50mm
square peg into the ground with a mallet to see how firm the ground is. Excavate If the driveway is going to be at the same level
as the existing ground, then at least 150-300mm of earth must be removed. A
common trait of cowboy practices is that the foundations are inadequate and the
drive doesn’t last. If you are doing it yourself, you should hire a mini-digger
and a skip to take away the soil you dig up. If you find areas that seem softer than the rest,
dig them out or you may end up with unwanted dips in your drive. If the driveway is going to be higher than the
existing ground then the edges need to be contained. These will be the weakest
area so make the foundations wider than the actual drive surface. Weed Control Apply weedkiller then use a Weed Membrane or a Geotextile
layer such as ‘Weedblock’ laid on the ground surface to prevent weeds popping
up in your new drive. It will also prevent the subsoil mixing with the hard
core base. Hard Core Now comes the base. Scalping stone (quarry scrap)
is cheaper and easier to lay and level than the old traditional broken brick
hardcore. Its recommended that between
150-200mm (6-8”) of hardcore is laid. The company supplying your aggregate will
be able to tell you how many tonnes you need given the size of your drive. Hire a Compaction plate to compact down the stone
base. This should mean that the drive has a firm base and there are no soft
spots. If there are, they need to be dug out and replaced with more hardcore
which is compacted again. Sand Layer If the finished drive is to have block paving,
then a layer of coarse grit sand needs to cover the hardcore base. This is also
leveled and compacted down. On the Surface Once you have a good base, there are several
surfaces that you can use for your driveway: Gravel: Is cost effective and comes in different sizes
and colours. Allows water to percolate to reach roots of surrounding plants.
Needs to be topped up periodically. Tar & Gravel: Looks like gravel but has a layer of tar
underneath to hold gravel in place. Over time, gravel gets pushed into the tar
so may need more every 7-10 years. Asphalt: is a smooth dark black surface. It needs to be
sealed to stop water getting into cracks and freezing. Concrete: the colour can be altered by adding different
aggregates to the concrete. Permeable Block Paving: Blocks come in a range of colours and can be
laid to create a pattern. Laying of paving should be done by a professional. Impermeable Block Paving: Where ground conditions aren’t suitable for
permeable blocks. You’ll need to use a drainage system to take water to a
soakaway within your property boundary. Resin Bound: A range of materials including gravel, crushed
rock and recycled materials are treated with a resin for a permeable surface
that comes in many different colours. Kerb Appeal Environmentally friendly or not, many people apply to
lower the kerb outside their house and pave over the front garden. It can add a
premium to your house if parking is limited. Most councils have a standard application process and will
do the work themselves or have approved contractors do it. If someone in your
household has a severe and permanent disability then you may get a discount.
You’ll need planning permission if the dropped kerb: •
is on
a main road or service road off it •
is to
a building divided into several properties, e.g. flats •
is
for offices, shops, health centres etc You will also need approval if the dropped kerb: •
is in
a conservation area •
is to
a listed building •
will
cross over land belonging to someone else If your new drive is more than 5m2 and
is surfaced with impermeable material that will not control rainwater running
off into roads you’ll need planning permission. |
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