Specifications and Guidelines For Upholstered Furniture
Wood Frame & Spring Construction
When specifying furniture, there are several points that should be made clear to the manufacturer regarding the materials to be used and the quality of construction that is expected. A hardwood frame should be standard but to be on the safe side it would be a good idea to make it a comment in the specs of all the pieces being submitted for quoting.
In Canada BC Maple with 6-7% moisture is the preferred choice for frame construction.
Frames should be screwed, glued and double doweled for proper strength.
BC Maple is also suitable for show wood as in legs, arms, or other details where the wood is to be seen. If an alternative wood is to be used it should be taken into consideration that this will increase the cost and most likely the lead time
Spring & Coil Construction
Seat springs are available in either coil or sinuous types and which to choose is determined by the intended use of the seat. Webbing should not be used in commercial applications but are suitable for residential. Coil springs provide greater comfort and are typically used for lounge chairs or sofas and are only used for the seats. In dining chairs and stools. Sinuous springs are preferable due to the limited space in the seat.
Sinuous springs are almost always used for the back of any piece of upholstered furniture.
In a sofa bed the bed mechanism replaces the springs for support.
The foam used in upholstered furniture comes in a variety of densities, firmness, and fire resistance. Fire codes for upholstered furniture in Canada & USA need to be CAL 117 to meet fire code. TBD 133 is the most stringent fire code in North America. Cities such as Boston & NYC where historically tragic fired have occurred require this type of application.
All foams are categorized by the two measurements of density measured in pounds per cubic foot and firmness measured by a process called indentation load deflection (ILD).
The density of foam is the weight of one cubic foot of the material. Although density does not determine the firmness they are tied together as softer foams are usually lighter. The density affects the cost and the life of the foam. The higher the density the more expensive the foam and the longer it will last. A density of 2.0-2.5 is the appropriate range for upholstered furniture used in commercial applications where there will be a high level of use.
ILD is determined by taking a sample of foam of a specific size (typically 50 cubic inches) and compressing it into a predetermined size. The amount of force in pounds to achieve this indentation is the ILD. A lower ILD means a softer foam. The chart below shoes the types of foams used at Credible Hospitality and they typical use.
Although the way foams are referenced vary from company to company the numbers used are standards. For example, 14230 has an ILD of 14 and a density of 2.30 lbs.
|1820||Super Soft||Back cushions (Box back style)|
|2535||Medium||Tight back or thick seat cushions|
|2545||Firm||Seat cushions, tight seats and backs|
*When using seats this soft it is recommended that their thickness be no less than 4” to avoid bottoming out. Fatigue softening is the tendency of foams to feel softer after repeated use and compression. Higher densities will last longer before succumbing to fatigue however testing of all densities in the Qualux line have been shown to the last over 50 years without loosing its load bearing properties.
Gel Memory Foam Sofa Mattress
Latest in Gel Memory Foam Sofa Technology
A gel memory foam sofa mattress can support each part of the body evenly and individually.
Ventilated Gel Memory foam slowly and automatically adjusts to your body weight and temperature. In addition to the slow, comforting response, gel memory foam offers complete, luxurious and stress free support. This can allow the spine to stay in a neutral position. Additionally, when you do move in bed, memory foam gently “fills in” and reshapes itself to your new sleeping posture, cradling every part of your body.
Latex foam is a high-endurance, supportive foam surface allowing the utmost comfort in seating and back support. Latex foam conforms adequately to body shape, providing the best seating experience. Latex mattresses have a well-deserved reputation in terms of durability.
Natural rubber is a polymer of isoprene and is sourced from the milk of the rubber tree. Typically, a few percent of other materials, such as proteins, fatty acids, resins, and inorganic materials are found in high-quality natural rubber.
- Instantly responds to body shape, ensuring proper conformance and support.
- Excellent air circulation.
- Excellent breathability.
- Is not heat sensitive and performs well at any normal temperature.
- Pressure relief; less tossing and turning, resulting in rejuvenating sleep.
- Environmentally friendly; bio-degradable. (only 100% natural rubber tree latex)
- High quality natural rubber is inherently anti-microbial, dust mite resistant, and hypoallergenic.
Bed Mechanism & Mattress Specification
When a sofa bed is being specified the dimensions of the desired mechanism will determine the internal clearance required to accommodate the selected mechanism. The chart below shows different sized of mechanisms and the minimum internal width required to fit that size.
Once the internal size has been determined the outer overall dimensions can be determined.
When the sofa is being designed the internal width can be thought of as the distance between the inside of the arms. The depth required is typically 32” and the clearance required for the opening once the seat cushions are removed is a minimum of 23”. The front of the sofa between the seat cushions and the legs must be no less than 9.5”. Sofa bed mattresses should be spec’d with 290 coils, 6” mattress with F2 ticking.
MECH SIZE INTERNAL WIDTH REQUIRED MATTRESS SIZE
Single 44” 39”x71”
Double 60” 54”x71”
Queen 68” 60”x71”
Upholstery Techniques & Specification
When specifying fabric, specifically when requesting a quote that requires necessary yardages, it is important to note if there is a direction to the fabrics, whether or not fabric is railroaded or up the roll and which direction stripes or patterns are to be applied to the furniture. In the event that there is a pattern the pattern repeat must be included, as it will affect yardage allowance. Tight upholstery must always be indicated.
There are several finishing options for upholstery in regards to stitching and welt (also referred to as piping). Welt is available in several sized the most common being ½” and ¼” and are sometimes done in double welt.
Specifications and Guidelines For Casegoods
Dimensions & Site Coordination
Site condition is always the biggest challenge, as it may strongly affect the way the goods are manufactured and designed. For a successful on a project, understanding the site condition and coordinating with the GM of the property are our first steps. Knowing all details from the point the product leaves our facility and travels through the hallway, elevator, all doorways to where the furniture will sit is an important factor in how the furniture gets manufactured and packaged. Cut-outs for wire management, extra blocking for support, type of wall that our products will be installed to, and/or the height and size of base boards and ceilings are some major areas of our considerations.
As this is the main material on most of the case goods furniture, CH proudly provide premium grade sheet goods from our trusted and reliable suppliers worldwide. Our sheet goods are Eco-friendly and FSC certified.
For veneering and plastic laminating, high pressured veneering and laminations on both sides is our standard practice as this prevents warping. Typically, we use premium grade MDF on furniture faces and grade B plywood for structures that would hold heavy weight.
All wood is Kiln dried to 6-7% moisture and treated to be insect and vermin free. We carefully choose our use of wood to have plugs, knots, splits, pitch pockets, and or rough grain.
Others: Metal, Stone, Glass, Plastic
We can strongly provide all kind of material parts to execute your design. We work with several trusted partnered companies to ensure you’ll receive the best quality product and meet the lead times.
We boast in providing the highest quality German hardware – Hafele on all our products such as drawer slider, door hinges and soft close features