Browse Forums General Discussion Re: Engineered wood (I-Joist, LVL) Versus Solid timber joist 10Nov 13, 2020 12:32 pm Simeon McGovern Affordable Custom Homes, We design and build to your budget Ashington Homes www.ashingtonhomes.com.au Re: Engineered wood (I-Joist, LVL) Versus Solid timber joist 11Nov 13, 2020 12:34 pm Pulse definitely I joists, dead straight and stable. F graded Solid timber has strength variation between sticks so difficult to ensure they won’t deflect. veneer based joists like I joists and LVLs average out these variations. Water resistance is not relevant indoors Much more environmentally friendly too great reply, very very true Simeon McGovern Affordable Custom Homes, We design and build to your budget Ashington Homes www.ashingtonhomes.com.au Re: Engineered wood (I-Joist, LVL) Versus Solid timber joist 12Nov 13, 2020 12:34 pm My experience with engineered joists and LVL is that they have greater bounce I have used engineered joists throughout my home 14M span over several walls but in the kitchen I added 2x 300 KDHW F17 solid joists to reduce bounce, all good. Just get your engineer to check design for bounce. Foremost Building Expert in Australia,assisting with building problems/disputes, building stage inspections,pre-contract review advice for peace of mind 200 blogs http://www.buildingexpert.net.au/blog Re: Engineered wood (I-Joist, LVL) Versus Solid timber joist 13Nov 13, 2020 12:38 pm building-expert My experience with engineered joists and LVL is that they have greater bounce I have used engineered joists throughout my home 14M span over several walls but in the kitchen I added 2x 300 KDHW F17 solid joists to reduce bounce, all good. Just get your engineer to check design for bounce. what centres were they at? Simeon McGovern Affordable Custom Homes, We design and build to your budget Ashington Homes www.ashingtonhomes.com.au Re: Engineered wood (I-Joist, LVL) Versus Solid timber joist 14Nov 13, 2020 1:20 pm 450 centres but engineered timber joists for some reason have greater dynamic deflection than solid timber. Most builders and engineers are not aware of it. I know because we had couple of jobs with excessive bounce and we fixed it by adding solid beams. Engineer typically will only do static calculations and miss dynamic altogether. On long I spans I always recommend 2 rows of herringbone strutting to stiffen up. Foremost Building Expert in Australia,assisting with building problems/disputes, building stage inspections,pre-contract review advice for peace of mind 200 blogs http://www.buildingexpert.net.au/blog Re: Engineered wood (I-Joist, LVL) Versus Solid timber joist 15Nov 13, 2020 1:42 pm building-expert My experience with engineered joists and LVL is that they have greater bounce I have used engineered joists throughout my home 14M span over several walls but in the kitchen I added 2x 300 KDHW F17 solid joists to reduce bounce, all good. Just get your engineer to check design for bounce. Thanks for the advise. Do you only recommend using F17 solid joists in high traffic areas (such as your kitchen) rather than the entire floor? Re: Engineered wood (I-Joist, LVL) Versus Solid timber joist 16Nov 13, 2020 1:43 pm SejaeD world2160 Pulse definitely I joists, dead straight and stable. F graded Solid timber has strength variation between sticks so difficult to ensure they won’t deflect. veneer based joists like I joists and LVLs average out these variations. Water resistance is not relevant indoors Much more environmentally friendly too I was thinking about water resistance under the bathroom. Will I-Joist be risky in those areas? I am just trying to determine the best material to use. Cost is not an issue (to an extent). Sounds like F graded solid timber (as joist) is becoming obsolete because it is an overall inferior product? You wont have any water issues with LVL's or I joists for that fact. as the earlier poster said the modern products are engineered to be stronger, straighter and have far greater spans. also with modern waterproofing the bathroom will outlast our own lifespan. but as alex said, if you can afford it, go with bondeck. Cost difference will probably be around $100/sqm but a far better result cheers Simeon http://www.ashingtonhomes.com.au I will ask the builder about bondeck. Will it be too heavy for my existing brick veneer foundation? Re: Engineered wood (I-Joist, LVL) Versus Solid timber joist 17Nov 13, 2020 1:53 pm world2160 building-expert My experience with engineered joists and LVL is that they have greater bounce I have used engineered joists throughout my home 14M span over several walls but in the kitchen I added 2x 300 KDHW F17 solid joists to reduce bounce, all good. Just get your engineer to check design for bounce. Thanks for the advise. Do you only recommend using F17 solid joists in high traffic areas (such as your kitchen) rather than the entire floor? It depends, bounce in bedrooms or lounge may not matter but you don’t want your plates and glasses rattling in the kitchen when you walk. It depends on design, spans and use. Foremost Building Expert in Australia,assisting with building problems/disputes, building stage inspections,pre-contract review advice for peace of mind 200 blogs http://www.buildingexpert.net.au/blog Re: Engineered wood (I-Joist, LVL) Versus Solid timber joist 18Nov 13, 2020 9:49 pm https://www.tilling.com.au/wp-content/u ... 8.web_.pdf this has a good section on dynamic performance. I joists are light, LVLs will have better dynamic performance as they are heavier. 300mm F17 hardwood is nice but probably comes out of a beautiful big eucalypt whereas the LVL is plantation grown pine. The eucalypt would be better used as a nice table or something, in my opinion, still the F17 is nice stuff Re: Engineered wood (I-Joist, LVL) Versus Solid timber joist 20Nov 19, 2020 6:07 pm aussieta i would have thought LVL joists would be at least as strong as solid timber am i mistaken Yes they are just as strong but I was talking about bounce Foremost Building Expert in Australia,assisting with building problems/disputes, building stage inspections,pre-contract review advice for peace of mind 200 blogs http://www.buildingexpert.net.au/blog Engineering timber is certainly a less fuss option, times cheaper to supply and install and better withstands humidity. 1 15887 Thanks Simon, I guess I'm no concerned with the volume of the noise rather that dead and hollow sound and feel that is associated with floating floors. But I'm not sure… 3 6114 Assuming you've modelled the TB8, TB10, TB12, TB2 & J1 joists/LVLs there, it appears as per drawing to me. There maybe should be an additional J1 between TB10 and T12 if… 3 31780 |