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Hardwood For House Roofing 2x2, 2x3, 2x4, 2x6, 1x12, 3x4 call 08182481552 / How To Calculate Materials For Concrete In Raft Foundation / How To Calculate The Price of a C of O and Governor's Consent In Lagos Yourself (2) (3) (4)
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How To Calculate Hardwood Needed For Your House Roofing by Nobody: 8:30pm On Jun 27, 2014 |
A home is gotten when you look for comfort based on your fantasy, but a shelter is a necessity, and a building becomes a shelter when it can prevent rain,water,sun, strong wind and other climatic elements from affecting the occupants- human,animal, living and dead loads with personal effects. As far as I am concerned the moment you have your roof placed on a building, other things are important but they are basically needs. You can’t move into a house without a roof , but we have seen people living in a house with no window or makeshifts windows covered with ordinary bags and cardboards. So it is very important to calculate the dimension of the true length of a roof members. These dimensions are essential to determine the accurate span of Rafter, Wall plate, Tie beam, King Post, Overhang, Purlins, fan struts etc. Residential timber-framing construction clearly differentiate between spacing and span Spacing the centre-to-centre distance between structural members, unless otherwise indicated. Span the face-to-face distance between points capable of giving full support to structural members or assemblies. In particular, rafter spans are measured as the distance between points of support along the length of the rafter and not as the horizontal projection of this distance. Single span the span of a member supported at or near both ends with no intermediate supports. Continuous span the term applied to members supported at or near both ends and at one or more intermediate points such that no span is greater than twice another. Span/length calculation for roof members. As can be seen the span of the rafter in the figure below is not quite in agreement with the Code but we will use the figures for the rafter span as calculated below. Wood/ timber are sawn into various sizes amongst are 2” by 2” i.e 50mm by 50mm 2” by 3” i.e 50mm by 75mm 2” by 4” i.e 50mm by 100mm 2” by 6” i.e 50mm by 150mm 3” by 4” i.e 75mm by 100mm 3” by 6” i.e 75mm by 150mm 18 Likes 9 Shares
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Re: How To Calculate Hardwood Needed For Your House Roofing by Nobody: 8:34pm On Jun 27, 2014 |
From the picture above you can see the height of the roof of building and the length and breadth of building is already shown in the floor plan, so left to be known is the rafter or the fall ‘x’ as shown in diagram above. Remember the Pythagoras theorem in secondary school days used in calculating the longest part of a right angle triangle. The numbers of wood to be calculated also depends on spacing for the purpose of this exercise, we are using the format in diagram above as our specifications for our calculations. For ceiling noggins of 600mm centers it simply means the wood are nailed 600mm apart, so add the breadth of plan and 600mm as overhangs both sides i.e 7,800mm or 7.8m +1200mm or 1-2m=9meters Then divide by 0.6m=15pcs of 16.975m of 50 by 50. For the longitudinal portion, 16.975+1.2m(the overhangs of 0.6m both sides)=18.175m then divide by 0.6=31 pcs of 9m of 2” by 2” ( Note how the length on one side is used to calculate the pieces/numbers of wood required for the length of the other side) So to know the number of 2 by 2 to buy in the market for the ceiling noggins- 18.175m x 15pcs=273m of 2” by 2” 9m x 31pcs=279m of 2” by 2” Total=552m In the market, the wood comes in 3.6m per piece So 552/3.6=153 pcs of 2” by 2” timber to buy in the market for ceiling noggins. WALL PLATE is the timber/wood that are placed on top of blocks or roof beams as the case may apply, so for the fastest way to calculate this, is to add the entire walls length and divide by 3.6m to know the numbers of pieces you need. I am using approximately 100m. So for 100m, divide by 3.6=28pcs of 3” by 4” or 75mm by 100mm to purchase in the market for timber named wall plate. For FACIAL BOARD, remember the length and breadth of the plan of the building with its overhangs of 0.6m each, so add the perimeter 9m+9m+18.175m+18.175m=54m Divide 54m by 3.6m=15pcs of 1” by 12” For TIE BEAM, going by the section, it was recommended that we lay the timber named tie beam which is 2” by 6” or 100mm by 150mm at 1.2m centers apart. So what we need to do is to follow the same format used in calculating the ceiling noggins but it is going to span only the breadth of 7.8m only. So divide 18.175m by 1.2m centers (spacing) =15pcs of 7.8m =117m, then divide by 3.6m to know the numbers to buy/purchase in market. 117/3.6=32pcs of 2 by 6 of wood termed as tie beam to buy in the market. STRUTS are a bit complex to calculate, they are the members placed diagonally as shown in diagram to connect the rafter with tie beams. We can use the numbers of tie beams and multiply by 2- i.e 32 pcs multiply by 2=64 pcs of 3 by 4 or 75mm by 100mm termed as struts to be bought in the market. For RAFTER, check the height of roof and the breadth of plan to determine the rafter which is the falling portion of the roof (except is already given from the section) Lets take the height of the roof as 3.5m and the breadth of plan plus overhang is 9m. 12 Likes 4 Shares
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Re: How To Calculate Hardwood Needed For Your House Roofing by Nobody: 8:39pm On Jun 27, 2014 |
With the diagram above applying Pythagoras theorem X2 (rafter length )=4.52+3.52 X=5.7m Rafters are nailed side by side tie beam and struts. So we use the numbers of pieces of tie beams because they are also spaced at 1.2m center to center and multiply by 5.7m 15 pcs of rafter (same as tie beam) multiply by 5.7 =85.5m Now divide by 3.6m to know the numbers of 3” by 4” to purchase in market=24 pcs of 3” by 4” required for rafters. PURLINS are the wood of 2” by 2” or 50mm by 50mm we nail the roofing sheets on. Purlins are spaced based on designs or type of roofing sheets. But for our calculations, we are using 900mm spacings. Going by diagram above add 5.7m +5.7m for both sides=11.4m Divide 11.4m by 0.9m to know the numbers required =13 pcs of purlins of length 18.175m (The purlins has to span the length of the building which is 16.975 plus 1.2m for the overhangs by sides) So 13 by 18.175m=236m Now divide by 3.6m to know the numbers requires to purchase in market =236/3.6 =66 pieces of 2” by 2” to purchase in market for the purlins. KINGPOST is that piece of wood that stands at the middle of two rafters falling at the opposing sides. Is the one that spans vertically from the tie beam/rafter line, so just the same way we calculated for rafter, remember 15 pieces and multiply by the height of the roof 3.5m=52.5m Then divide by 3.6m to know the numbers to buy in the market. Therefore 15 pieces of wood of 2″ by 6″ termed kingpost is needed to be bought in the market. Credits of this Articles goes to: http://buildingcontractorsecrets.com/2012/12/how-to-calculate-timber-roof-members/ 12 Likes 2 Shares |
Re: How To Calculate Hardwood Needed For Your House Roofing by Nobody: 11:46am On Jun 28, 2014 |
when buying hardwood for roofing, consider Akun, Itara, Ogborugboru, Koko Igbo, Ayin, they are good wood that stand the test of time 8 Likes 2 Shares |
Re: How To Calculate Hardwood Needed For Your House Roofing by Nobody: 4:05pm On Jun 29, 2014 |
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Re: How To Calculate Hardwood Needed For Your House Roofing by Onisuru1(m): 9:23pm On Jun 29, 2014 |
hello good evening, can you help with the quote for roofing a building with the of 10750mm by 28000mm. using nigerite absetors and pvc celling. regards 2 Likes 2 Shares |
Re: How To Calculate Hardwood Needed For Your House Roofing by mufutau55(m): 10:32pm On Jun 29, 2014 |
H$LBroker: Thank you H$LBroker. This is a very good instructions and lectures... It will be very useful to many people here. Hajji Mufutau 4 Likes 2 Shares |
Re: How To Calculate Hardwood Needed For Your House Roofing by Nobody: 9:58am On Jun 30, 2014 |
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Re: How To Calculate Hardwood Needed For Your House Roofing by Nobody: 2:53pm On Jun 30, 2014 |
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Re: How To Calculate Hardwood Needed For Your House Roofing by Nobody: 9:04pm On Jun 30, 2014 |
Hardwood For House Roofing 2x2, 2x3, 2x4, 2x6, 1x12, 3x4 call 08067586332 |
Re: How To Calculate Hardwood Needed For Your House Roofing by Nobody: 11:12am On Jul 02, 2014 |
H$LBroker: |
Re: How To Calculate Hardwood Needed For Your House Roofing by Nobody: 9:31pm On Jul 03, 2014 |
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Re: How To Calculate Hardwood Needed For Your House Roofing by Nobody: 1:38pm On Jul 07, 2014 |
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Re: How To Calculate Hardwood Needed For Your House Roofing by Nobody: 8:23pm On Jul 08, 2014 |
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Re: How To Calculate Hardwood Needed For Your House Roofing by Nobody: 11:06am On Jul 09, 2014 |
HsLBroker: A home is gotten when you look for comfort based on your fantasy, but a shelter is a necessity, and a building becomes a shelter when it can prevent rain,water,sun, strong wind and other climatic elements from affecting the occupants- human,animal, living and dead loads with personal effects. 1 Like |
Re: How To Calculate Hardwood Needed For Your House Roofing by Nobody: 3:02pm On Jul 09, 2014 |
HsLBroker: From the picture above you can see the height of the roof of building and the length and breadth of building is already shown in the floor plan, so left to be known is the rafter or the fall ‘x’ as shown in diagram above. |
Re: How To Calculate Hardwood Needed For Your House Roofing by Nobody: 11:47am On Jul 10, 2014 |
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Re: How To Calculate Hardwood Needed For Your House Roofing by Nobody: 9:58pm On Jul 10, 2014 |
HsLBroker: .. |
Re: How To Calculate Hardwood Needed For Your House Roofing by Nobody: 11:12am On Jul 11, 2014 |
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Re: How To Calculate Hardwood Needed For Your House Roofing by Nobody: 8:42pm On Jul 17, 2014 |
Meaning of a King Post A king post extends vertically from a crossbeam to the apex of a triangular truss. The king post connects the apex of the truss with its base, holding up the tie beam (in tension) at the base of the truss. King posts were used in timber framed roof construction in Roman buildings, medieval architecture in buildings such as parish churches and tithe barns. They also appear in Gothic Revival architecture, Queen Anne architecture and into modern times. Said to be the oldest and simplest truss, the oldest surviving roof truss in the world built between 548 and 565 is a king post truss in Saint Catherine's Monastery, Egypt. Also, king post trusses are used to construct wood and metal bridges. The post can be replaced with an iron rod called a king rod (or king bolt) and thus a king rod truss. The king post truss is also called a "Latin truss". In traditional timber framing, a crown post looks similar to a king post however is very different structurally. The king post is in tension, usually supporting the tie beam as a truss but the crown post is supported by the tie beam and is in compression. The crown post rises to a crown plate immediately below and supporting collar beams, it does not rise to the apex like a king post. Historically a crown post was called a king post in England but this usage is obsolete. An alternative truss construction uses two queen posts (or queen-posts). These vertical posts, positioned along the base of the truss, are supported by the sloping sides of the truss, rather than reaching its apex. A development adds a collar beam above the queen posts, which are then termed queen struts. A section of the tie beam between the queen posts may be removed to create a hammerbeam roof. 1 Like
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Re: How To Calculate Hardwood Needed For Your House Roofing by Nobody: 6:47pm On Jul 21, 2014 |
What is a Purlin in Timber Trusses Roofing Members. A horizontal structural member which supports roof covering or a longitudinal member in a roof frame, usu. for supporting rafters or the like between the plate and the ridge. In architecture, structural engineering or building, a purlin (or historically purline, purloyne, purling, perling) is any longitudinal, horizontal, structural member in a roof except a type of framing with what is called a crown plate. In traditional Timber framing there are three basic types of purlin: purlin plate, principal purlin and common purlin. Purlin plates in wooden construction A purlin plate in wooden construction is also called an "arcade plate" in European English, "under purlin", and "principal purlin". The term plate means a major, horizontal, supporting timber. Purlin plates are beams which support the mid-span of rafters and are supported by posts. By supporting the rafters they allow longer spans than the rafters alone could span thus allowing a wider building. Principal purlins in wood construction Principal purlins in wood construction, also called "major purlin", "side purlin". Principal purlins are supported by principal rafters and support common rafters in what is known as a "double roof" (a roof framed with a layer of principal rafters and a layer of common rafters). Principal purlins are further classified by how they connect to the principal rafters: "Through purlins" pass over the top; "butt purlins" tenon into the sides of the principal rafters; "clasped purlins," of which only one historic U.S. example is known, are captured by a collar beam. Through purlins are further categorized as trenched, back, or clasped; butt purlins are classified as threaded, tenoned, and/or[clarification needed] staggered. Common purlins in wood construction Common purlins in wood construction, also called a "major-rafter minor-purlin system". Common purlins are typically "trenched through" the top sides (backs) of principal rafters and carry vertical roof sheathing (The key to identifying this type of roof system). 2 Likes 1 Share
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Re: How To Calculate Hardwood Needed For Your House Roofing by Nobody: 6:48pm On Jul 21, 2014 |
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Re: How To Calculate Hardwood Needed For Your House Roofing by Nobody: 7:47pm On Jul 22, 2014 |
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Re: How To Calculate Hardwood Needed For Your House Roofing by Nobody: 7:32pm On Jul 27, 2014 |
HsLBroker: .... 1 Like |
Re: How To Calculate Hardwood Needed For Your House Roofing by Nobody: 8:13am On Jul 29, 2014 |
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Re: How To Calculate Hardwood Needed For Your House Roofing by Nobody: 6:35am On Jul 31, 2014 |
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Re: How To Calculate Hardwood Needed For Your House Roofing by Nobody: 9:58pm On Jul 31, 2014 |
HsLBroker: .... |
Re: How To Calculate Hardwood Needed For Your House Roofing by Nobody: 7:11am On Aug 01, 2014 |
HsLBroker: What is a Purlin in Timber Trusses Roofing Members. |
Re: How To Calculate Hardwood Needed For Your House Roofing by Nobody: 12:51pm On Aug 02, 2014 |
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