Bulging flank wall
- Thread starter Maria14
- Start date
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Maria14, Hi.
There is a good system made by "Helifix" [have a look on the net for this firm]
One of their [many] systems allows for small diameter twisted rods to be drilled into the outer wall and into the first floor, floor joists. Works PROVIDED the floor joists are running parallel to the wall being restrained, the thin rods pass through the outer wall and into several joists that are running parallel to the wall.
But over the "gap" of the access stair, there is [obviously] no joists to fix the Helibar into, so fitting an external horizontal beam appears to be one solution, BUT making it appear unobtrusive is difficult.
How large is the bulging wall, how large is the bulge?
Ken
There is a good system made by "Helifix" [have a look on the net for this firm]
One of their [many] systems allows for small diameter twisted rods to be drilled into the outer wall and into the first floor, floor joists. Works PROVIDED the floor joists are running parallel to the wall being restrained, the thin rods pass through the outer wall and into several joists that are running parallel to the wall.
But over the "gap" of the access stair, there is [obviously] no joists to fix the Helibar into, so fitting an external horizontal beam appears to be one solution, BUT making it appear unobtrusive is difficult.
How large is the bulging wall, how large is the bulge?
Ken
Whats causing the bulge?
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Maria14, hi again.
Shows how good Tele is tonight?
Bulging in "Solid Walls" is unfortunately not Un-Common, it happens when a wall is [spot the anorak wording from now on?] a slender wall, ground floor to roof has a "gap" that is the stair well and is not able to get "support" or "restraint" to lessen the effects of "bulging" occurring in the wall. Over the entire area of the stair well a distance vertically of about [a guess] 5 Meters, and a width of about the same can and will allow this area of wall to in effect "Buckle" because the wall simply cannot sustain its "verticality" [for want of a better word] over the entire surface area of the wall.
Think of the wall as a thin board, like a sheet of hardboard and apply a small amount of pressure on the upper edge it will buckle or bulge between the top surface and the ground it is resting on. If you "introduce" a solid "restraint" or in the case of a wall the first floor then the degree of slenderness of the wall is halved. obviously over the area of the "unrestrained stair well" the wall will buckle and bulge.
Has anyone confirmed this to you? Is it making any sense? are my estimates over the sizes about roughly correct?
Has anyone, builder / surveyor given you any possible answers as to how to address the problem?
Ken
As an aside this problem is known as the "slenderness ratio" and has a property of the first and second moment of Inertia [Useless info unless a structural engineer]
Shows how good Tele is tonight?
Bulging in "Solid Walls" is unfortunately not Un-Common, it happens when a wall is [spot the anorak wording from now on?] a slender wall, ground floor to roof has a "gap" that is the stair well and is not able to get "support" or "restraint" to lessen the effects of "bulging" occurring in the wall. Over the entire area of the stair well a distance vertically of about [a guess] 5 Meters, and a width of about the same can and will allow this area of wall to in effect "Buckle" because the wall simply cannot sustain its "verticality" [for want of a better word] over the entire surface area of the wall.
Think of the wall as a thin board, like a sheet of hardboard and apply a small amount of pressure on the upper edge it will buckle or bulge between the top surface and the ground it is resting on. If you "introduce" a solid "restraint" or in the case of a wall the first floor then the degree of slenderness of the wall is halved. obviously over the area of the "unrestrained stair well" the wall will buckle and bulge.
Has anyone confirmed this to you? Is it making any sense? are my estimates over the sizes about roughly correct?
Has anyone, builder / surveyor given you any possible answers as to how to address the problem?
Ken
As an aside this problem is known as the "slenderness ratio" and has a property of the first and second moment of Inertia [Useless info unless a structural engineer]
The only sure way is to re-build it. If you are concerned about it now, so will any future buyer of the house, and it won't get any better.
But find the cause; often it can be caused by a slight tilt of the foundation, which in turn can be caused by leaking drains running along the base of the wall.
But find the cause; often it can be caused by a slight tilt of the foundation, which in turn can be caused by leaking drains running along the base of the wall.
Maria14 Hi again.
Problems all over the place
The fitting and use of restraints, such as "Helifix" will not pull the wall back into a plumb position, rather these type of [and other products] will in effect "freeze" the wall in whatever position it is in, the "bulge" will not be removed.
But with your problem, and especially with the stair, in effect a large void at the first floor level that the wall cannot get support from is a real pain
options? external render that is "sculpted" to be thicker in some places than others? or install external insulation and render again "sculpted" so that the worst visual effects of the bulge are reduced?
Hope this gives some ideas?
Ken
Problems all over the place
The fitting and use of restraints, such as "Helifix" will not pull the wall back into a plumb position, rather these type of [and other products] will in effect "freeze" the wall in whatever position it is in, the "bulge" will not be removed.
But with your problem, and especially with the stair, in effect a large void at the first floor level that the wall cannot get support from is a real pain
options? external render that is "sculpted" to be thicker in some places than others? or install external insulation and render again "sculpted" so that the worst visual effects of the bulge are reduced?
Hope this gives some ideas?
Ken
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