Basement wall thickness on march 21 2019 by amik lawriter oac 4101 8 4 01 foundations best basement flooring options wall thickness retaining design basement insulation detail for walls. For plain concrete walls which are walls without or with little reinforcement 7 12 inch thickness is adequate. Under identical soil conditions the load experienced by a 9 foot basement is around 50.
basement wall thickness basement retaining wall thickness
In any type of soil lateral soil pres sure increases with depth so tall walls get more pressure than short walls.
Basement wall thickness. Lastly some type of waterproofing system like kochs tuff n dri with drainage piping is a must. 1 in case the floor area is less than 500 square feet the wall thickness may be 8 inches. When a taller wall or a higher level of soil or both come into play the thickness should increase to 10 inches. Basement wall thickness the irc is a good reference in my opinion.
For all other buildings exterior party fire and bearing walls above foundations shall have the following minimum thickness in inches. These figures can vary due to differences in local building codes. Typically poured walls go up quicker and finish off better. 12 inches wall 100 high with 94 of backfill 8 inches.
This with reduce lateral pressure on the foundation and provide a dry basement. In my area 12inch poured walls with plenty of reinforcement would probably be the prescription. They have to be 8 feet or less in height with a difference of not more than 4 feet between the inside floor level and the finish grade on the outside wall. But a structural engineer is must.
Minimum wall thickness 3500 psi concrete wall 80 high with 74 of backfill 6 inches. A single flat 2x4 member may be used as a header in interior nonbearing walls for openings up to 8 feet in width if the wall above is not more than 24 inches. Poured concrete foundation walls that are less than 8 feet tall and have soil outside that is 6 or 7 feet deep against the wall can often be 8 inches thick and function quite well. Natural light and ventilation safety glazing for concrete basements.
10 to 12 feet of offset is serious especially in clay. In general poured concrete basement walls that are 8 feet tall or less and have no more than 7 feet of soil pressing against them from the outside function well at a thickness of 8 inches. Its important to consider not just the walls construction but also the drainage provided and the way the wall is tied to the houses floor frame. Minimum wall thickness 4500 psi concrete.
Basement walls designing. As soon as you go higher or have greater depths of soil pushing against the wall you need to increase the thickness to 10 inches. 10 inches wall 90 high with 84 of backfill 8 inches. Masonry foundation walls shall be not bless than the thickness of the wall supported except that masonry foundation walls of at least 8 inch 203 mm nominal thickness shall be permitted under brick veneered frame walls and under 10 inch wide 254 mm cavity walls where the total height of the wall supported including gables is not more than 20 feet 6096 mm provided the requirements of section r40411 are met.
The minimum thickness is also determined by wall height soil classification and the height of unbalanced backfill or backfill on only one side of the wall.
