No one likes the feel of a supposedly solid floor bouncing or sagging underfoot. Blocking and cross bracing helps transfer part of a floor load to the adjacent truss or joist. If your foundation has a crack or cracks know what to look for to determine if they are major or minor. How To Install Two-Ply Roof Underlayment. If the sub floor is 1/2 inch thick and it should have been 5/8 or 3/4 of an inch thick, then you may get sponginess or sagging. However as you can see on the following video new floor is bouncy (and it looks even worse than on the video). Over the years this type of damage and deterioration will cause a floor to flex or feel spongy and if not attended to, it will fail. As homeowners we quickly get used to a floor that has a little bouncy or spring to it as we walk across it and seldom give any thought to whether there is a problem. Spongy and bouncy floors generally are of little concern unless the cause relates to a serious structural issue. How long will a house last is a question that many wonder about when they buy a house. If the concrete slab is not flat but dips in places or has a hump, then the flooring laid on top of the slab may bow or be spongy when stepping on the areas that dips or does not have a fully flat surface. We receive a small commission if you choose to purchase a product or service after following one of our affiliate links but the price is the same for you. Flatness of the floor. He knew the building code allowed simple 2 x 10’s to span the width of the addition but he instructed the architect to put in wood floor trusses that were 20 inches tall! 7 Common causes of spongy or bouncy floors, 2. My bedroom is over a double garage. Moisture stains on the floor may indicate that there has been a leak or moisture issues. If a floor is only slightly spongy and there are no other warning signs that point to a problem, then the majority of people will just monitor the issue. Sloped floors are common in older homes, and even in homes as new as 15 to 30 years. Many homes on raised foundations may have a post and beam construction supporting the floors. The old-fashioned mud method of floating a thick mortar bed in preparation for the tile has given way to using cement backer board over a plywood subfloor. Matt knew all about bouncy floors and insisted that his wood-frame bedroom floor be as stiff as a steel-reinforced concrete slab set on steel i-beams! Sloping floors may be a warning sign of structural problems. Wood floor joist are horizontal structural framing members placed on their edge running from wall to wall or wall to beam. Who does wonder about a spongy or bouncy floor? Damage from rain and snow doing construction, 4. Taylors: Springy floor upstairs !! This changes the level of support for the home and often results in some floors being bouncy or spongy and if the soil is an expansive type of soil and there is poor drainage; then the home may even experience seasonal sponginess. It is not uncommon for this type of construction to have post piers that will settle or shift over time. Sloping floors are most often caused by normal and acceptable deflection (bend) in the wood joists which comprise the floor structure. How to Fix Springy and Spongy Floors. (3 Posts) Add message | Report. Contributing editor Mike Guertin teams up with structural engineer David Grandpré to detail six common, and not-so-common, ways to stiffen up the joists and keep the china cabinet from wobbling. Spongy and bouncy floors are normally not a significant problem but in a few instances,  they can be a warning sign of a structural issue. - See 1,054 traveller reviews, 134 candid photos, and great deals for Tavistock, UK, at Tripadvisor. Since one of the warning signs of foundation or framing problems is a spongy or bouncy floor, engineers will usually examine why a floor or section of a floor is spongy. Depending on a number of factors, if you have a floor that spans 10 feet in length, then a defection of a 1/4 or 1/3 of an inch might be acceptable. As homeowners we quickly get used to a floor that has a little bouncy or spring to it as we walk across it and seldom give any thought to whether there is a problem. A sub floor generally lays on top of floor joists or floor trusses and will normally be laid perpendicular to the joist or trusses: it should be considered structural in nature, not cosmetic. © 2020 Buyers Ask. Contractor Filed a Lien – What Are Our Options? This process normally requires an engineer to calculate what size the foundation is required, what size of rafters and how far apart they should be and to calculate what size of floor joist or trusses are needed; including the type and thickness of the sub floor. per square foot.Using some quick math and a good bit of Googling, I figured out that my little upstairs bedroom could safely hold quite a bit of weight. Does anyone have or have had bouncy floors upstairs? Doing this helps stiffen a floor and reduce sponginess or bounciness. Termite damage to floor joist or truss, 5. Most floors are laid over or supported by either a concrete slab, floor joist or floor trusses. Check the base boards and lower portions of the wall for stains as well. Mr Sparkle 8 Jan 2019. Home » Interior » Floors » Bouncy and Spongy Floors Can Be A Structural Concern Or Merely An Annoyance. … 'bouncy ' upstairs floors: concrete slab bouncy upstairs floor uk it ’ s spongy, then there may be a and... 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