Do all houses have cripple walls
Almost all Bay Area houses built before 1940 (and many built more recently) have cripple walls.
Cripple walls are the short wood stud walls that enclose a crawl space under the first floor.
Non-retrofitted or “unbraced” cripple walls are known to be vulnerable to damage and even collapse in earthquakes.
How do you frame a cripple wall
Cripple walls are braced by nailing plywood sheathing to the inside of the walls that surround the crawlspace. A licensed contractor can complete a retrofit for houses with cripple walls shorter than four feet, or a skilled homeowner can do it, following a standard plan set.
What does a cripple wall look like
A cripple wall is a wooden wall between the foundation and the first floor of a wood frame house. This wooden wall is usually less than a full story high and runs between the foundation and the first floor. Often it looks like it’s half the height of a regular wall, and it is part of a basement.
What is the purpose of cripple studs
Cripple walls are the short wood stud walls that enclose a crawl space under the first floor. Cripple walls are used to support a dwelling between the concrete foundation and the floor of a dwelling and to elevate the dwelling above ground to allow access to the utility lines or to level a dwelling built on a slope.
How do you reinforce cripple walls
To brace a cripple wall, add horizontal or diagonal blocking between the vertical studs at the top and bottom of the cripple wall. Plywood can also be anchored to the interior face of the cripple wall, as well as to the sill plate below the foundation to increase its strength. Effectiveness: Somewhat effective.
How much does brace and bolt cost
A brace-and-bolt retrofit typically costs between $3,000 and $7,000 and helps to prevent the house from toppling off its foundation during strong shaking. The CEA offers premium discounts of up to 20 percent on earthquake insurance policies for houses with qualifying retrofits. Eligible homeowners have until Nov.
What is a header in wall construction
Headers take the weight of the materials and occupants above and transfer it via the trimmers down to the floors and foundations below. Longer openings require larger headers. Bearing walls (those that carry the weight of joists and trusses) require larger headers than nonbearing walls.
What are the names of the three plates that are necessary to frame a wall
Each wall has three plates: a bottom plate and two top plates. The bottom plate, also called the sole plate, ties the bottom ends of the studs together.
What is a sill in construction
A sill plate or sole plate in construction and architecture is the bottom horizontal member of a wall or building to which vertical members are attached. The word plate is typically omitted in America and carpenters speak simply of the “sill”. Other names are ground plate, ground sill, groundsel, and midnight sill.
What is a cripple stud in construction
In carpentry, the term “cripple” refers to a special-purpose wall stud or roof rafter. A cripple stud is located above a door or window or below a window. … Both cripple studs and cripple rafters are made from the same stock as other studs and rafters—they’re just cut shorter.
Is earthquake retrofitting effective
Properly retrofitted houses are made stronger against earthquake shaking and damage. This means your house is safer, and you’ve reduced the chance of injury or even death in a devastating earthquake.
What is a short wall called
From Wikipedia, the free encyclopedia. A pony wall is a short wall. In different circumstances, it may refer to: a half wall that only extends partway from floor to ceiling, without supporting anything. a stem wall, a concrete wall that extends from the foundation slab to the cripple wall or floor joists.
What is a double top plate
A second top plate, also known as a “double plate” or “very top plate” is applied in the field to lock together intersecting walls.
What is a cripple
(Entry 1 of 3) 1a sometimes offensive : a lame or partly disabled person or animal. b : one that is disabled or deficient in a specified manner a social cripple. 2 : something flawed or imperfect.
How do I know if I have cripple walls
Go under the house through the crawl space, to see if there are any cripple walls. If there are cripple walls, check to see if they are braced. If you have neither of these, the cripple walls are probably insufficiently braced or unbraced. Horizontal or vertical wood siding is not strong enough to brace cripple walls.
What are exterior cripple walls
Cripple walls are wooden stud walls on top of the exterior foundation. They support the weight of the house and create a crawl space. … Bracing the cripple walls by using structual-grade plywood is simple and provides greater resistance to earthquakes.
How much weight can a cripple stud hold
When hanging items on a stud, a screw in the stud can support between 80 and 100 lbs. An entire stud wall could support 20,000-30,000 lbs depending on its length. The main thing is that you want to distribute the weight across as many studs as you possible.
What does a jack stud do
A jack stud is a stud that has been cut down to be placed above and/or below an opening. The jack stud provides support to the lintel trimmer and sill trimmer.