Self Build Diy Conservatories Base Construction
Many times we
have been asked how a DIY conservatory base should be constructed. We
have compiled a basic guide which should cover the majority of cases
and answer your questions.
of a typical Diy conservatory base is very similar to that of an extension
to your house.
It is a general
belief that; a Diy conservatory is lighter than an extension
the foundation does not have to be very deep. This is not necessarily
Firstly it is
not possible to know precisely how deep the foundation will be until
the ground is excavated and inspected for any 'made up areas' -
this is where earth has been placed on existing ground.
will be necessary to excavate a trench through this layer into load
bearing ground. By doing this you will ensure that the conservatory
has a good foundation base, as we expect that you do not want to
wake up one morning to find your Diy conservatory at the bottom of your
trenches are between 650 - 1000mm deep.
The other factors
which determine the foundation depth will be tree roots, drains
of Ground Levels
The areas where
your Diy conservatory is to be built should have any hard materials
removed, i.e. patio, concrete slab, etc. and any vegetation soil
removed to an approximate depth of 150mm.
of Foundation Trench
foundation trenches are excavated to the following dimensions. (Ready
to receive a mass concrete foundation) 450mm wide by 650/1000mm
deep dependent upon ground conditions.
Where an existing
drain punctures a foundation the foundation must be below the drain
invert (bottom of drain) and a precast lintel placed above the drain
so ensuring that no weight is put onto the drain.
foundation trench can now be concreted. A mass fill is normally
used as this tends to be quicker and therefore cheaper. The concrete
is normally finished 150mm below ground level.
It is always
a good idea to knock 350mm x 10mm steel pins into the side of the
trench at 600mm centers leveled with a spirit level so you will
know when the concrete in the trench is at the correct height.
From the foundation
level build up the D.P.C. level in matching brickwork to the external
face and common bricks or concrete blocks to the inside skin.
and Foundation Construction
slab reinforced with a 142 steel mesh on 50mm sand blinding, on
250 micron damp proof membrane on 150mm (min) well consolidated
Construction with a Suspended Floor
the ground where your Diy conservatory is to be built drop away more
than 600mm (2ft) a timer or concrete suspended floor may be more
desirable and be more cost effective.
With a suspended
floor air bricks must be built into the substructure to ensure subfloor
ventilation is achieved.
Should your Diy conservatory
design be glass to floor the base would normally be left at this
stage with a D.P.C. (damp proof course) bedded onto the external
brickwork. Ready for the conservatory to be erected we would add
that the brickwork and concrete are normally left to cure for approximately
5-10 days dependent upon weather conditions.
From the D.P.C.
level the brickwork can then be raised to the required height in
cavity brickwork. Normally the cavity would be insulated with either
expanded polystyrene of fiberglass to ensure a high degree of insulation
to the conservatory. The 2 walls are held together with wall ties.
In some conditions
specialist foundations may be required e.g. brown filled sited (these
are areas where old buildings have been demolished and a new development
built, or areas where there are trees or very poor ground). All
of these areas can be built upon but specialist foundations may
be required such as a raft or piled foundations.
is a Good Working Guide only, details may vary from supplier to