[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

GSBN: Earthbags FYI; low-income/emergency possibilities



	Some of you probably have already received this directly from the guy. I
also have 9 photos, let me know if you want me to send them to you offlist.
(I don't agree with everything below, but there's ideas worth thinking about.)

*

From: LOUIS taaibos@...

To whom it may concern

BOABAB Investment Holdings Limited has patented the Eco-Home concept
internationally and are now wishes to penetrate the international market.

In South Africa a large number of residents have been build and has been
extremely successful and well received by the public.

Eagerly awaiting your response.

Kind Regards

LOUIS BAARTMAN
Chief Executive Officer
 
Tel. Office +27 +21 440 9656
Fax           +27 +21 421 8930

*

Does a house that:
	* Do not blow away
	* Do not wash away
	* Do not burn down
	* Largely unaffected by seismic activity
Interest you?

YES, well let me hear from you!

Let me introduce you to the Eco-Home.

What is an Eco-Home
	The Eco-Home using the "Building by Bag" system was originally developed
to become a building system to assist South Africa in its endeavour to
house millions of homeless residents. The system is based on sound
engineering principles and has developed into a housing system that can now
be documented as "conventional". The subject of the technology is two
patented products:

The Eco-Beam
	The Eco-Beam is constructed using two timber sections, (commonly two 38 x
38 wooden battens, but increasing in dimension as may be required), which
are joined together by a lattice made of a single galvanised steel strip
(hoop iron).
	Being fed through a press using a specially designed "die" has shaped the
strip.
	The shape of the strip enables it to be nailed (either by hand or by nail
gun) in a zigzag fashion between the two timbers sections are held firm and
absolutely parallel on a worktable between two pieces of angle iron.  The
table has an adjustable component, which enables a beam of any required
width to be constructed.  For larger beams, heavier timber sections and a
heavier gauge of hoop iron are used.  The beam sections are easily joined
to any required length.

The system of Construction using Eco-Beams and Sandbags
	The system is formally presented as a modified timber frame house.  The
frame of the house is constructed with Eco-Beams forming the base, wall
plates and boxing for the walls, all of which are constructed of 38 x 38mm
brandering.  The general width of the wall is 270mm and the uprights are
spaced approximately 900mm apart.  Any type of window or door can be
mounted on the frame.  The bulk of the wall is then provided by the
sandbags, which are 280mm square, with a pillowslip type closure.  Each bag
is filled with about 7kg of ordinary sand or similar material and laid
inside the framed walls like bricks.
	The services are easily installed in the timber frame prior to the laying
of the sandbags.  The finish of the walls is a matter of choice afforded by
the sides of the beams that are exposed at about 900mm centres.

Plaster Finish:
	Chicken wire can be stapled to the Eco-Beams covering the bags, which can
then be plastered in the usual fashion.

Product Specifics
The Eco-Beam:
	The Eco-Beam (Patent #: 95/10317 dated 5th December 1995) is constructed
using timber sections, two 38mm x 38mm battens, (header and footer) but
increasing in dimension as required.  These are joined by an Eco-Web
lattice (galvanized metal strip) pressed by a simple, "fly press".  The
shape of the strip enables it to be nailed (either by hand or nail gun) in
a zigzag fashion between the two timber sections, while the two timber
sections are held firm and absolutely parallel on a work table between two
pieces of angle iron.
	The table has an adjustable component, which enables a beam of any
required width to be constructed.  For larger beams, heavier timber
sections and heavier gauge of hoop iron are used.  The beam sections are
easily joined to any required length.
	Should curved or pre-stressed beams be required, these can be easily
formed using Eco-Beam Technology. All these beams are manufactured in a
simple jig; any warped, twisted or short length timber that would normally
not be suitable for construction can be used to fabricate an Eco-Beam.

Advantages of the Eco-Beam
	* Manufactured at any location with minimum facilities
	* Adjustments to lengths easily made
	* All materials are easy to handle and transport
	* All beams are straight & uniform in size, despite variations in timber
size because it is manufactured on straight jig
	* Easy joining makes it possible to produce any length
	* Curves can be built into the beams
	* Beams can be "pre-stressed" by routing a grove in the bottom chord and
tightening a cable placed in the grove
	* Both Eco-Web (lattice) and timber can be painted or varnished to achieve
a pleasant effect
	* Top & bottom chords can be different sizes or different timber species
	* If a solid beam look is required, the beam can be boxed
	* In ceilings, upstairs floors, the beams allow for services and ventilation
	* Bent or warped timber chords will be straightened in the process
	* Bolts can be used through top and bottom chords
	* Rectangular timber chords can be used on either of the two dimensions to
produce beams of different stress qualities

Note: The Beams have enormous industrial and commercial applications. A box
formed with  beams is easily shuttered from outside by simply fixing
shutterboards to the timber.  Re-inforcing steel is easily tied to the
lattice, enabling a "post & beam" construction for larger buildings.  The
system is particularly suited for the construction of Community Halls,
Cr?ches, Factories, Churches, Health Clinics, Police Stations, multi storey
etc.

Eco-Bags (Patent #: 96/4218 dated 24th May 1996)
	300mm x 300mm specialised bags using geo-fabric, stitched in a pillow case
style. An advantage of the above said material is adhesion of the plaster
to the bag.

Insert diagram
	300 mm
	100mm
	300 mm

The construction of Eco-Homes using the Eco-Beams & "Building by Bag" System
Foundation and Floors:
	A conventional foundation and slab is pre-laid to the floor size of the
house.  The system formally presented as a modified timber frame house.
The frame of the house is constructed with Eco-Beams forming the base, wall
plates and boxing for the walls, which are constructed of the 38mm x 38mm
brandering.  The general width of the walls is 270mm and the uprights are
spaced approximately 900mm apart.  Any type of window or door can be
mounted on the frame.  The bulk of the wall is then provided by the
sandbags, which are 280mm square with a pillowslip, type closure. Each bag
is filled with 7kg of ordinary sand or similar material (not more than 15%
organics) and laid inside the framed wall like bricks, in a bonded fashion.
 One sandbag is equivalent to two bricks.
	The services, such as electricity and plumbing are easily installed in the
timber frame prior to the lying of the sandbags. The finish of the walls is
a matter of choice afforded by the sides of the beams that are exposed at
about 900mm.

Examples are:
	Plaster finish.  Chicken wire can be stapled to the Eco-Beams covering the
sandbags, which can then be plastered in the usual fashion.
	Board/Timber finish.  The exposed beams enable a sheeted or planked timber
finish to be affixed using conventional nailing.

The Eco-Beam is a ready substitute for roof trusses and by virtue of its
strength and adaptability, will make available roof space that is not
ordinarily found in a conventional roof truss construction.
	The pre-structured walls are erected using a framework of Eco-Beams being
laid directly on the foundation and 0.25mm PVC sheeting as the damp course.
 The sidewalls are attached at the corners with nails and galvanized metal
strips.
	The floor is constructed in the conventional method.

Advantages of the Eco-Home System of Construction
	* Construction can take place at locations where road access for heavy
trucks, which carry bricks and cement, is not available or practical.  It
also eliminates congestion to any highway or road normally caused by such
traffic.
	* NO ELECTRICITY is required at the construction site and only minimal
water and cement is needed.
	* 1,500 bags of sand can be fitted into the boot of a small car.  This is
the equivalent of 3,000 bricks that would normally be used to construct the
same size house.
	* The construction technique is easily mastered within a few days, without
any prior building experience needed.
	* It is a community friendly product enabling all the community to be
involved in the upgrade of their living environment.  It not only blends
but also enhances the natural surrounding area and offers the team building
spirit of the community to come together as one.
	* One person can easily handle the Eco-Beams at the site in all phases as
the product is specifically designed to be user friendly and lightweight.
	* The only 'wet' trade required is in the plaster phase of construction.
The plaster adheres easily to the pre-wet sandbags & chicken wire, which
are both adhesive friendly.
	* No bricks litter the building site which in turn eliminates two factors:
		Theft of bricks
		Site clearing which is a major cost on any building site. (Unused
sandbags can be taken away and stored overnight, due to the lightweight
aspect and returned the next day, reducing the prospect of theft).

The wet sandbags encased behind the plaster enable the plaster to 'cure'
instead of merely drying as it does in standard construction. The end
result is an extremely hard cement finish to the walls. In the case of a
timber clad building, the system resists fire because the material around
the sandbags simply melts.  The sand then escapes and extinguishes the fire.
	The sand walls have excellent thermal and acoustic qualities.  The air
between the sand acts as a buffer between differences in temperature and
sound levels both inside and outside the wall.
	The walls are solid, durable & safe that when tested, an AK-47 bullet was
unable to penetrate the wall.

'R' öValue is the ability for a material to resist the transfer of heat or
cold from one side to the other. George to add 'hand' link for more info on
this subject (outlined below for now)
300mm of Sand					= 'R' 22.00
Concrete Blocks (three core) 4 inch	= 'R' 0.71
Concrete Blocks (three core) 8 inch	= 'R' 1.11
Common Brick 4 inch				= 'R' 0.80
Face Brick 4 inch				= 'R' 0.44
the greater the number, the better the insulation is.

	If water should penetrate the plasterwork it simply runs down through the
sand (sand is a natural filter) to the damp proof course.  Both clay and
cement bricks and blocks exhibit capillary action, which soaks up the water
or resists it flowing down to the damp proof course.
	The walls are easily changed, or errors remedied during the course of
construction.  The least possible damage is done to the environment in
which the construction takes place.
	This type of construction is the best defense against natural disasters.
The sandbag is the traditional defense against flood, while bulk and
flexibility ensures great protection from seismic activity.
	All normal damp proofing is applied to the building and apart from the
building system all normal considerations apply.