the theoretical size of a load bearing beam required to support a particular weight is easy to calculate, but the choice of the actual beam depends on taking into account the factors of the particular situation.
to size engineered beams and headers you begin with load per foot of beam. with engineered wood, you use both live load and dead load values. live load determines stiffness and total load is used to determine strength. the sizing steps are:
a load bearing wall carries weight from floors and/or roof above, while a partition wall merely separates two rooms. when you remove a load bearing wall, you have to add a beam to carry the weight the wall supported (see figure a, with accompanying details, in additional information, below).
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for load-bearing walls, it is an entirely different story. if the wall is load-bearing, you will need to carry the weight of the level above by other means, such as constructing a beam or buying a special laminated beam. tools and materials you will need. replacing a load-bearing wall with a support beam requires surprisingly few materials.
boises laminated veneer lumber (lvl) is a product that uses multiple layers of thin wood assembled with adhesives. lvl offers several advantages over typical milled lumber: made in a factory under controlled specifications, it is stronger, strhter and more uniform.
its 7.62mm soviet load gives a max damage of 36 and a min damage of 24 for a three-hit kill to 34 metres, a four-hit kill to 48 metres and a five-hit kill at any distance beyond that. it also does a powerful two-hit kill in hardcore mode at ranges up to 40 metres.