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Shelter Construction
1)
Basic Shelter
Tudor timber framed building
methods are emulated.
The robust construction of Littlethorpe shelters is achieved
using durable, heavy timbers combined with traditional methods. Mortice,
Tennon and Doweled joints are used throughout the main construction while
computers are used for the design work.
The picture below shows the top
outside front corner and a number
of dowels for extra strength.
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Each component is carefully machined with modern machinery to
a high degree of accuracy, this allows the finished product to be assembled
in our factory with strong, tight fitting joints, quickly, neatly and
safely, even though the shelters weigh about 1000kg each.
Tudor timber
framed houses were built with heavy durable timbers using the same joints
that are used in Littlethorpe shelters. Littlethorpe also use durable heavy
timbers and consequently except the life of the shelters to be very long.
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The main timbers are 140mm x
140mm square posts with 70mm x 200mm rails jointed into them, the rails
(combined with our traditional construction methods) are so strong there has
never been an incident of a rail snapping even when the shelter has been hit
by a vehicle.
The vertical, close timber boarding is 44mm thick and is
designed to accommodate natural shrinkage and expansion of the whole shelter.
The exceptional thickness of the boarding (44mm) was chosen to resist attack
by vandals who may use anything from bricks and scaffold poles to karate
style kicks to try and destroy any type of street furniture; so far we have
not had a single board broken.
Littlethorpe shelters have in the past been hit by vehicles;
the force that our shelters have been hit with has been enough to split the
six inch square posts down the middle, despite this none of the joints broke,
which means the joints are actually stronger than the material they are made
from. The shelters also stayed together thus not causing an urgent public
safety issue. We conclude; Tudor carpenters may not have benefited from
computers but they knew a lot about joinery..
2 ) Roofs
Visually balanced, strong
and durable
Mono pitched roofs :
The main roof decking consist of 45mm thick tongued and grooved,
pressure treated softwood planks, the planks are glued together to form
one very strong surface which is screwed down to the main part of the
bus shelter frame with approximately 100 x 100mm long screws.
The whole roof is then covered with special galvanized steel sheets
which have a plastic coating bonded to it. The sheets are bent to form a
seamless joint at the edges of the roof.
This type of roof covering is considerably more durable than a felt
roofing system.
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The whole roof is strong enough to carry a considerable weight; either a
snow load or a number of people should they climb onto the roof for
reasons of maintenance or of mischief. The steel roof covering is not
only durable against the weather but also against deliberate damage; it
can not easily be bent at the edges, prised up or pierced.
Pitched
roofs with gabled ends :
The 30 degree gable ends are built from solid FSC certified hardwood.
The roof substance is the same 45mm thick pressure treated softwood as
the mono pitched roofs and screwed down in the same thorough way; the
roofs are edged with hardwood instead of steel sheets; it is important
that the softwood is protected from the weather, especially the end
grain.
The underside of the roof has an open void; the underside of the roofing
planks are sprayed to match the hardwood and can be seem from below,
this forms an attractive feature.
Once the roof structure has been formed it is very strong and is ready
for the final covering, which is usually cedar shingles, these are a
wooden tile made from cedar. Cedar shingles are the roof covering of
choice in much of
North America and
Canada and have a life
span of forty to fifty years.
Pitched
roofs with hipped ends :
The hipped roofs have a solid flat ceiling, (made from the same 45mm
thick planks used on the other roof types) this overhangs the main
shelter and is edged with a hardwood strip, unlike the gabled roofs
there is no open roof void.
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Shelter showing tiles and
roof
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The structure of the roof pitch is made as a traditional “cut” roof from
50mm x 100mm softwood timbers for the common rafters and hip rafters.
This strong roof is braced further with 18mm thick plywood sheets that
form the under surface onto which the cedar shingles are fixed.
If
a Littlethorpe shelter with a pitched roof is installed in an area where
local slate or stone, feature predominantly in the architecture,
this local roof covering may be specified in
preference to cedar shingles..
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3)
Seating
Hardwood – warm in winter, cool
in summer
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Bench seating is factory fitted to all shelters except the “Cropston” as a
standard fitting. It is fitted at a height of 500mm from the ground and
runs along the rear wall of the shelter.
A
different height may be specified by request.
The
seating consists of two 140mm x 45mm thick FSC certified hardwood planks
supported at each end and in the centre. The Cropston style of shelter
does not have a seat as standard because it is usually installed where
there is very little room on the pavement. A seat can be added to the
Cropston as an extra item.
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Rettonden shelter showing the
top of the seating |
4) Glazing
Safety glazing is standard
Laminated safety glass 6.4mm thick is fitted as standard.
The glazing system is “vertical shuffle glazing” secured with hardwood
beading and silicon down both sides.
There is no horizontal beading to trap water or to get perished by the
weather.
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T he
hardwood beading on the sides are secured with stout brass screws, our
thinking, which has so far proved correct is; if it takes a strong man
with a large screw driver to put the screws into the wood, a kid with a
Swiss army knife will not be able to take them out again.
In addition the glass won’t come out by itself even if the beading
has been removed because the glass is also stuck in with silicone.
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The pitched roofed Redmile shelter |
Extra thick toughened safety glass is available as an optional extra and
includes a 12 months money back guarantee should breakage occur. Our
thinking is; if the glass is robust enough to remain unbroken in the
first year there is a high probability it will give the same
performances in each subsequent year.
Polycarbonate or any other glazing material can also be fitted as
alternatives to real glass.
See our Guarantee page regarding
glazing and breakages.
Copyright © 2008 Littlethorpe of Leicester
Ltd |
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A member of the British
Woodworking
Federation | | |