Construction Solutions - Kneeling Creepers



Solution: Kneeling Creepers
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	Description:	Many construction tasks require frequent kneeling, squatting, or stooping because the work is close to the foor. Kneeling on a hard surface puts a lot of direct pressure on your knee, while squatting puts stress on the tendons, ligaments, and cartilage of the knee joint. Working in either position often or for long periods of time can lead to knee problems, including knee osteoarthritis. If you work in a stooped position, there is stress on your lower back as well as your knees, possibly leading to back pain and even a serious back injury. The photo on the left shows the problem, while the photo on the right illustrates the solution. More Detail There are several types of wheeled kneelers available, such as the Racatac™ and MasterRac™. These models have removable seats and cushioned knee supports. They are very low and have 2-3 inch casters. The MasterRac™ knee supports are only 3/4 inch above the foor. The cushioned knee supports reduce the pressure on your knees, just as ordinary knee pads do. These models are available with an adjustable cushioned chest support (optional on the Racatac™, but standard on the MasterRac™). It is useful when doing prolonged foor-level jobs like tile setting and concrete patching. It helps support your weight, reducing back strain and some of the pressure on your knees. Less Detail
	Risks Addressed:	When the job requires kneeling or squatting to work at foor level, these devices will reduce the stress to your knees, ankles, and lower back. These devices also can reduce stooping, since they make kneeling at floor level more comfortable
	How Risks are Reduced:	Wheeled kneelers provide support when work must be done in awkward and stressful positions. They reduce stress on the knees and lower back, and can help prevent serious muscle and joint problems. Quality of Evidence Safety and health experts believe there is a risk reduction. Biomechanical research shows that high compression forces occur in the spine while stooping, and that sustained or repeated flexion of the spine may decrease the stability of the lower back and increase the risk of fatigue, leaving the back more vulnerable to injury. While there is considerable research shows that working in stooped, kneeling and squatting postures causes low back disorders, the research mostly focuses on those postures in combination with other risk factors such as bending or twisting or heavy loads. The literature combining stooped, squatting or kneeling postures with load handling shows rapid and severe spinal damage. There is much less in the literature regarding the health effects of these postures in an unloaded situation - that is, stooping without lifting. However, safety and health experts believe that it is importnat to avoid prolonged and repeat forward bending of the back (stooping) even in the absence of the other risk factors for low back disorders.
	Effects on Productivity:	Since floor level work can be done with less discomfort and pain, productivity may increase. Wheeled kneelers also allow workers to move around more easily and quickly. Many models also have an area where tools can be conveniently placed. Both factors may increase productivity. Quality of Evidence Manufacturers or vendors have reported an increase in productivity. Safety and health experts believe there is an increase in productivity. No actual measurements of productivity improvements are available. This improvement is expected based on the experience and judgement of medical and safety professionals reviewing this solution page.
	Return on Investment:	No specific calculation ROI information exists for this particular solution, however, there are some general approaches that might be useful for a “Return On Investment” analysis. For a general discussion of these approaches, visit our “Return on Investment Calculation” page.
	Availability:	Where to Get It Racatac™ Products Inc., Church Point, LA, www.racatac.com Approximate Cost The Racatac™ costs less than $200 and its optional adjustable chest support is around $75. The MasterRac™ comes with the chest support and costs less than $300.
	Additional Considerations:
	Hazards Addressed:	Carpentry Frame floors, walls, ceiling, stairs and roofs using wood and/or metal studs Kneeling & Squatting Install and finish flooring Kneeling & Squatting Install doors, windows and associated hardware Kneeling & Squatting Electrical Cut, shape and place conduit and wire trays Kneeling & Squatting Install and maintain electrical control system Kneeling & Squatting Install and maintain motors, pumps, fixtures, lights Kneeling & Squatting Install and repair high voltage lines, transformers, switches Kneeling & Squatting Install interior wiring systems Kneeling & Squatting Pull wire through conduits Kneeling & Squatting Splice and connect wiring systems Kneeling & Squatting Work with or remove old wiring Kneeling & Squatting Excavation & Demolition Deconstruct building foundations Kneeling & Squatting Remove or recycle interior structures, doors and windows Kneeling & Squatting General Labor Construct and remove concrete forms (sidewalks) Kneeling & Squatting Heavy Equipment Operation Maintain heavy equipment Kneeling & Squatting Insulation & Lagging Attach insulation with tape, staples, glue, wire and bands Kneeling & Squatting Blow and place insulation into walls, ceilings and thermal controlled areas and equipment Kneeling & Squatting Install and apply fire stop products Kneeling & Squatting Maintain and remove old insulation including asbestos Kneeling & Squatting Place finished insulation around duct, pipes, tanks, vessels and mechanical equipment Kneeling & Squatting Spray and trowel fireproofing onto columns and beams Kneeling & Squatting Interiors, Drywall & Glass Frame walls using wood studs, metal studs and door bucks Kneeling & Squatting Install and finish wood flooring Kneeling & Squatting Install cabinets, countertops, molding and doors Kneeling & Squatting Install floor coverings, carpet and tile Kneeling & Squatting Install partitions or cubicles Kneeling & Squatting Install terrazzo and polished concrete Kneeling & Squatting Move and install drywall or panels Kneeling & Squatting Place and install fixtures and hardware Kneeling & Squatting Tape, mud and sand drywall Kneeling & Squatting Masonry, Cement & Plaster Applying coats of plaster or stucco Kneeling & Squatting Chipping, scraping and grinding surfaces or joints Kneeling & Squatting Forming, pouring, laying or applying refractory materials Kneeling & Squatting Laying or setting brick, block, stone, tile or marble Kneeling & Squatting Stooped postures Mixing cement, mortar, plaster, or grout Kneeling & Squatting Spreading, leveling, and smoothing concrete, mortar or terrazzo mixtures Kneeling & Squatting Paints & Coatings Abrasive Blasting Kneeling & Squatting Apply street markings Kneeling & Squatting Hand tool surface preparation Kneeling & Squatting Mechanical Surface preparation Kneeling & Squatting Paint machinery, piping, signs, etc. Kneeling & Squatting Pressure wash and chemical surface prep and stripping Kneeling & Squatting Tape and sand wallboard Kneeling & Squatting Pipes & Vessels Assemble pipes, tubing and fittings Kneeling & Squatting Cut, thread, hammer and bend pipes and vessel tubes Kneeling & Squatting Deburr and grind pipes and vessel tubes Kneeling & Squatting Dig, grade, level and cover trenches Kneeling & Squatting Disassemble and remove damaged or worn pipe Kneeling & Squatting Install bricks and other refractory materials in fireboxes Kneeling & Squatting Lay and align pipe in trenches Kneeling & Squatting Weld, braze, solder, cut, or gouge pipe sections or vessel parts Kneeling & Squatting Stooped postures Reinforced Concrete Cut or bend rebar Kneeling & Squatting Finish concrete Kneeling & Squatting Surface grinding or cutting Kneeling & Squatting Residential Construction Build forms and reinforcing for footings and foundations Kneeling & Squatting Install and finish flooring Kneeling & Squatting Install electrical Kneeling & Squatting Install plumbing Kneeling & Squatting Install roofing shingles or tiles Kneeling & Squatting Lay block or brick Kneeling & Squatting Roofing Install asphalt roofs Kneeling & Squatting Sheet Metal & HVAC Apply caulk, cement and mastic sealants Kneeling & Squatting Stooped postures Assemble fittings and fasten seams and joints using hand and power tools Kneeling & Squatting Clean, remove and repair existing ductwork/HVAC Kneeling & Squatting Stooped postures Install flashing, rain gutters and down spouts Kneeling & Squatting Install risers Kneeling & Squatting Shape metal material over anvils, blocks or other forms Kneeling & Squatting Trim, file, grind, deburr, buff and smooth assembled parts Kneeling & Squatting Stooped postures Weld, braze and solder seams and joints Kneeling & Squatting Stooped postures Structural Steel Assemble and disassemble structural members in shop and field Kneeling & Squatting Drill, grind and saw materials Kneeling & Squatting Erect stairways, curtain walls, railings etc. Kneeling & Squatting More Links
	Sources:	Albers, James T., and Estill, Cheryl F. Simple Solutions: Ergonomics for Construction Workers. DHHS (NIOSH) Publications. March 2007. http://www.cdc.gov/niosh. To view the Table of Contents for the Simple Solutions Document, please visit: http://www.cpwr.com/simple.html. Please send requests for copies of this publication to cdcinfo@cdc.gov, referencing document number 2007-122.