MIFAB, Inc.CHAPTER 4

CHAPTER 4

FLOOR AND AREA DRAINS,

FLOOR AND AREA DRAINS

  1. Floor Drains and Area Drains are an upstream or entrance terminal to the buildings drainage system.
  1. Drains should be placed in any area where a water source is located.
  2. Considerations for Floor and Area Drains.

a)Sizing

  1. The potential volume of drainage needed by the drains.

b)Location Requirements

  1. Drains should be placed to avoid standing water and potential safety hazards.

c)Floor Construction

  1. Will determine if additional accessories are needed on the floor drain
  2. Such as, membrane clamps, extensions, underdeck clamps, etc...

d)Traffic Conditions

  1. The drain must be capable of sustaining the type of load to be supported by the floor.
  2. All top assemblies and strainers have a load rating based on the ANSI A112.6.3 standard.
  3. "Light Duty" all grates have a safe live load under 2,000lbs.
  4. "Medium Duty" all grates have a safe live load between 2,000lbs. and 4,999lbs.
  5. "Heavy Duty" all grates have a safe live load between 5,000lbs. and 7,499lbs.
  6. "Extra Heavy Duty" all grates have a safe live load between 7,500lbs. and 10,000lbs.
  7. "Special Duty" all grates have a safe live load over 10,000lbs. shall be considered special and treated accordingly.

e)Drain Top and Outlet Size

  1. The drain outlet size is determined by calculating the size of transverse pipe needed for proper drainage.
  2. Most commonly calculated by the using the Roof Drain Sizing guide on page 119 of the Price book.
  3. The free area of the grate is used to evaluate the ability to permit sufficient drainage to enter the drain.
  4. For interior applications, it is common to have the grate free area one and one-half times the transverse area of the connecting pipe.
  5. For exterior applications, it is common to have the grate free area two times the transverse area of the connecting pipe.

f)Drain Top Materials and Appearance

  1. Most non-load components, such as bodies, clamps, etc. are made from cast iron.
  2. Top assemblies and strainers are offered in ductile iron, nickel bronze or stainless steel.
  3. Some models are only offered in certain materials.
  4. Load bearing components, such as grates, are made from ductile iron.
  5. Ductile iron offers a much higher strength than cast iron.
  6. Most ductile iron top assemblies are available with stainless steel or nickel bronze veneers.
  7. The veneers give a stainless steel or nickel bronze finish while still offering the strength of the ductile iron grate.
  8. The veneers for frames are usually held in place be screws that spur into the frame. Or they are screwed, riveted, or welded directly to the frame.
  9. Grate veneers are either screwed to the ductile iron grate or clamped onto the grate.

g)Membrane Clamps

  1. Membrane clamps are used in membrane flooring to secure the waterproofing membrane to the floor drain body.
  2. Floors without waterproofing membrane do not need a membrane clamp because the top assembly can mount directly to the drain body.
  1. Catalog layout For Floor Drains

a)All floor drain assemblies start with "F" and are located in the front of the book.

b)Each assembly will show:

i)Model numbers and pricing

ii)Available outlet sizes and type

iii)Parts used to make the assembly

iv)Assembly adjustments

v)Load rating

vi)Strainer sizes

vii)Available options

CATALOG LAYOUT

CHAPTER 4-1

FLOOR AND AREA DRAINS