1980 FEMA Belowground Shelter Modified Ceiling 9p.pdf
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H-12-A
April, 1980
Protection is provided
in a basement corner
by bricks
or concrete blocks
between the overhead joists.
A beam
and jack column
support the extra weight.
HOME FALLOUT SHELTER
modified ceiling shelter-
basement location
FEDERAL EMERGENCY
MANAGEMENT AGENCY
.
,.
‘.
.
7
--!
ADJUSTABLE
POST
CENTER LINE OF
EXISTING BEAM
/
(OR WALL) -
PLAN
FOR 12’ x 16’ SHELTER
BLOCK UP ANY WINDOWS IN SHELTER AREA
B--l
., -.
._
.
.__
.:
.._
.,
:
:. ~
:
l-
I
A
r ADJUSTABLE
POST
8x8
PIER-
PLAN FOR 12’x 12’
SHELTER
2
r
#8x 2” WOOD SCREWS
l I "C. TO C. 21 PER PLYWD. PANEL
DRlLL 1/16”+ PILOT HOLE INTO
2 x 10 JOIST
EXISTING WOOD FLOOR, SUBFLOOR AND
2X 10 JOISTS AT 16” C TO C
2x4 NAILER IF REQ’D
18 BRICKS PER RUNNING FT. OF PLENUM SPACE
1/2” THICK x 2’-0” WIDE x 8’-
DFPA EXT GRADE PLYWOOD
WOULD BE STEEL ALUUSTAB
STEEL POST)
L STEEL ADJUSTABLE POST.
SEE BASE PLATE DETAIL
EXISTING BSMT
SECTION A
PANEL WIDTH
EXISTING SEAM
(OR WALL)
SECTION B
UT TO FIT
;~%#I!
&E@
VARIES ACCORDING TO
‘OSITION OF OUTSIDE JOIST
DR,LL
ROLES
IN
L,;(E
WITH HOLES IN COLUMN
BASE PLATE
1 FOUNDATION PLATE PLAN
ADJUSTABLE STEEL POST
BUTT JOINT DETAIL
EXPANSION ANCHOR
BASE PLATE DETAIL
SEE BUTT JOINT
PLAN
-A-
T
BUTT JOINT PLAN.
#ILINOy
PLAN
OF TYPICAL Pi. WIQ.
3
CAUTION
This home fallout shelter design should only be constructed in low risk areas.
A low risk area is one which is not expected to be subjected to the blast effects
of a nuclear weapon. It is suggested you contact your State or local civil pre-
paredness director for information concerning the type of area you live in, i.e.,
low risk or high risk area.
GENERAL INFORMATION
This shelter can be permanently installed in the basement of your
home and will not interfere with its utility in any way.
In basements whose walls are mostly below grade on all four sides,
adequate shelter from fallout radiation is provided by modifying the
overhead floor joist and ceiling construction as shown in the drawings.
The plywood, which is screwed to the bottoms of the joists, supports
the masonry shielding material and provides a solid base for a more
decorative ceiling treatment. A beam and jack post are used to support
the extra weight. Approximately 2 man days are required to construct
the ceiling.
SHELTER SIZE
The plans on the preceding pages show two sizes of shelters of this type -
a 12’ x 16’
size, which may be suitable for use in many one story homes,
and a
12’ x 12’
size, which is suitable for use in many two story homes.
On the following pages, under LIMITATIONS OF THE CEILING
MODIFICATION SHELTER IN BASEMENTS, you will find illustrations
of the conditions which make this type of construction an effective shelter,
and some additional things that must be done if these conditions are not
met by your particular basement situation.
Note that if some joist spaces contain heating ducts, or are closed
in with sheet metal to serve as return air ducts, the protection in
this area of the shelter is reduced since bricks or blocks cannot be
placed as shown in the drawings.
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