Browse Forums Outdoor Living Re: Bearer size - 1st post to group 2Feb 03, 2009 7:52 pm 140mmx45mm will span 1.6m fine as a bearer and 2.3m-2.6m as a joist depending on whether a single or continuous span. Re: Bearer size - 1st post to group 3Sep 02, 2009 3:24 pm I am just come across this post, and have the same question. I am planning a 9m (long) x 2.6(width)m deck off ground 280mm and using 140x45mm TP as bearer and joist, the bearer direct sit on the stirrup, and the joist will butt joint with the bearer using joist hanger. The joist will single span 2.6m, and the bear will continues span at 1.8m. As I understand, the two bearers are end only and only support half of the span (2.6). Does the bearer need to be two 140x45 TP or only a single 140x450mm TP? Re: Bearer size - 1st post to group 4Sep 02, 2009 6:31 pm 2.6m is too far for a 140x45 F7 treated pine joist to span - 2.4 would be maximum. The 140x45 will continuous span 1.8m though a span table will not show it as they only show bearers as being doubled up. In you case it would probably show 2/140x35mm. I have used 140x45mm a couple of times on its own as a bearer spanning 1.8 continuous and it was rock solid. Re: Bearer size - 1st post to group 5Sep 03, 2009 9:40 am Quote: I have used 140x45mm a couple of times on its own as a bearer spanning 1.8 continuous and it was rock solid. Are they middle bearer or side bear? If I am using 190x45 TP for the bearer and joist, does the Joist can single span 2.6m and single bearer continuous span at 2.8m? I have read Allan's span table, it shows double up the bearer as 2 x190x45. Would it be for middle bearer only which has full FLW (2.6m). I have only two bearers both only has half FLW (2.6/2). The reason I go for the large size of the joist and bearer, it needs less posts and may be less work( 2 row of bearer for 190x45) If I am using 90x45 for joist continues span at 1.3, I need three row of bearers continues span at 1.8; one 2x90x45 for middle bearer, two 90x45 side bearers. In this solution, the joist can sit either on top of the bearer or butt joint the bear with the joist hanger (if there is a joist hanger for 90x45). So what is the best size of the joist and bearer for this size of the desk? Re: Bearer size - 1st post to group 7Sep 03, 2009 8:33 pm nomad 190x45 F7 as a joist spans 2.6 easily but as a bearer spanning 2.8m 190x45 isn't sufficient. A single 140x45 F7 wont span 1.8m either. As a joist 190x45 will span 3.6m continuous and 3.3m single. A 140x45 will do a 1.8 continuos bearer span easily, have used and seen it many times. A friend of mine used 190x45 as a continuous span bearer spanning 3.0 metres with a FLW of 1.2m and they are rock solid - it was also passed by buiding inspectors. My own front verandah I have 190x45 bearers spanning 2.7 continuous, also certified. Another thing which creates variables albeit slight, is that rougher header treated pine is cuurently available as F5, F7 ans MGP10 which all have slightly different spans Re: Bearer size - 1st post to group 8Sep 04, 2009 9:10 am Dukekamaya nomad 190x45 F7 as a joist spans 2.6 easily but as a bearer spanning 2.8m 190x45 isn't sufficient. A single 140x45 F7 wont span 1.8m either. As a joist 190x45 will span 3.6m continuous and 3.3m single. A 140x45 will do a 1.8 continuos bearer span easily, have used and seen it many times. A friend of mine used 190x45 as a continuous span bearer spanning 3.0 metres with a FLW of 1.2m and they are rock solid - it was also passed by buiding inspectors. My own front verandah I have 190x45 bearers spanning 2.7 continuous, also certified. Another thing which creates variables albeit slight, is that rougher header treated pine is cuurently available as F5, F7 ans MGP10 which all have slightly different spans umm I have 1 table that shows it just does it and 2 that shows it fails (140x45) so I'd rather have a bit of safety factor in telling someone over the internet if it does it or not. "As a joist 190x45 will span 3.6m continuous and 3.3m single" That's strange because at the minimum FLW I have it showing 2.6 single and 3.0m continuous maybe your reading the F17 table and that is under the FLW required by the rldragon. But if your willing to sign of on all of this go ahead. Re: Bearer size - 1st post to group 9Sep 04, 2009 11:07 am Quote: My own front verandah I have 190x45 bearers spanning 2.7 continuous, also certified. Is that a single 190x45 and double up 2 x190x45? Re: Bearer size - 1st post to group 10Sep 04, 2009 11:08 am Quote: "As a joist 190x45 will span 3.6m continuous and 3.3m single" That's strange because at the minimum FLW I have it showing 2.6 single and 3.0m continuous maybe your reading the F17 table and that is under the FLW required by the rldragon. Would the FLW only be related to the bearer span? In Allan stanely book, it shows 140x45 seasoned F7 treaded softwood as joist spacing 450mm will span maxium 2600 mm, and 190 x 45 will span maxium 3600mm. In the timber solution sofware it caculate as 2500mm for 140x45, and 3600mm for 190x45. Re: Bearer size - 1st post to group 12Sep 04, 2009 6:16 pm I'm not looking at F17, I use these things nearly every day. You will find slight variations between differnet programs/tables of 100mm or so. The 190x45mm bearers in use I was referring to are single, not laminated. I have no problem recommending that size for those spans with that FLW, builders use it every day of the week in that application. You need to keep in mind deck spans are over-engineered for maximum large amounts of people on a concentated spot. Whilst span tables wil always show a double-up member for a bearer, they are often not stocked are very expensive and there are issues with nail or glue laminating 2 separate members on site. This is why the majority of the time larger single members are used. Re: Bearer size - 1st post to group 13Sep 07, 2009 11:21 am Balcony's are designed with additional loading but decks aren't unless the user adjusts the loads accordingly but even AS 1684'S deck tables don't have additional loading factored in. The user needs to know to adjust the loading to 3kpa. Seconded; we just used these last weekend to build a small deck. They worked perfectly as we have bluestone in the area where we wanted to build so digging down was not… 8 9277 Hi Mrboh Just wondering if you have any BAL or flame zone issues on your block, as getting compliance with BAL requirements whilst doing bearers and joists is tough. Not… 1 8558 Hi there, We’ve recently had plans approved to add a 1st storey addition to our existing house for a growing family in Sydney. With the current cost of building… 0 4643 |