H8 - Perform Renovations and Additions - LT #3 Flashcards
What is the Advantage of using Steel beams?
1) Less depth than wood and spans much further
What are the advantages of using engineered beams for renvoation work?
Engineered beam span farther than sawn nail laminated lumber, beam, can be designed to support point loads.
By replacing a load-bearing wall with a beam, the uniform load is changed to what kind of loads?
Concentrated (Point) Loads)
Why must a building’s structure be understood before renovations start?
To determine how existing loads are transferred to the foundations. (Determine where load-bearing walls and point loads are located)
Why must any new loads be transferred down to the foundation?
So that no part of existing structure becomes overloaded, leading to FAILURE.
What types of posts work well for temporary support?
1) Shore posts.
2) Teleposts
3) Wood posts with screw jacks.
What should be done before cutting into a wall?
Remove some cladding to inspect for wires and pipes.
What type of renovation typically uses scaffolding for temp. support?
Large Commercial and Industrial Projects.
Besides checking the load-bearing rating for a shore post or telepost, what should also be done before using the post?
Visual inspection for Cracks, Broken welds, or other damage.
Instead of removing temporary supports with brute force (Sledge hammer), what method should be used?
Gently with hydraulic or screw jacks.
What should be avoided when installing finishes?
Having continuous finishes across the joints between the new and existing structures.
What are the main purposes of renovations?
Main reasons for renovation:
Add floor area, accommodate disability, or modernize a building.
When is a Built-Up wood Beam best used?
When is a Built-Up wood Beam best used?
IF new beam or lintel does not bear a point load, and if space permits then a built-up wood beam of framing lumber may be enough and usually cost efficient.
Why are Engineered Beam (LVL) usefull?
Can span further than a beam made from sawn lumber, often can be designed with shallow depth to increase headroom.
Engineered beams are good when there is a point load, why?
Engineered beams are good when there is a point load, why?
Can be certified by the manuf. to support the load.
When an existing beam needs additional strength, instead of replacing the entire beam, sometimes a single ply of Eng. beam can be:
When an existing beam needs additional strength, instead of replacing the entire beam, sometimes a single ply of Eng. beam can be:
Bolted to side of existing beam
Problem with Steel beams:
Weight and extra work required to make wood to steel connections.
When an existing beam needs to be strengthened, how can it be strengthened?
sheet of 19 mm plywood glued and nailed to one or both sides or a steel plate can be bolted to one or both sides.
When removing all or part of interior load-bearing wall, it is critical to learn if joists are:
Continuous, lapped or butted on the wall.
If continuous or lapped enough to overhang the wall:
temporary support is only needed on the lapped sides. If butted, support will be needed on both sides.
When removing a wall, beam, lintel or post, what is needed?
Some temp. support.
Beams supported on posts can be used as temp. support, how?
Continuous sill or pad needed under post, unless verified to have enough bearing, because load becomes concentrated.
Scaffolding used in falsework can be used to support:
Large areas of floor, ceiling and roof, this type of temporary support is mainly used for large commercial and industrial jobs.
Advantages of teleposts:
As wood beams shrink, the telepost can be adjusted to compensate.
Teleposts are rated to support:
8000 LB and Concrete Shore posts rated for 14,000 LB
Quick and easy fix for repairing a rotting post:
Use a shore post or telepost makes this type of job relatively quick, simple and safe.
Adding new foundation alongside an existing foundation:
Concrete-To-Concrete connection should allow for some settling of new foundation
New foundation to existing foundation connection made:
To allow independent movement or lock the two foundations together by dowelling.
Method chosen by loading on the new concrete and the type of soil under concrete.
Where settlement is expected and/or probable, a space is created using:
Styrofoam or cardboard just above the existing footing to absorb any potential movement.
Joint between new and existing foundation wall needs to be:
Joint between new and existing foundation wall needs to be:
Sealed against water seepage. Using special gasket material, or using a membrane on the outside of wall.
Primary concerns when connecting existing framing to new framing?
Shrinkage and foundation settlement.
Shrinkage can be minimized by using Engineered beams and joists.
When using a steel beam to provide permanent support for joists:
Building Code calls for the beam to be laterally supported.
