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How to Save Money When Buying frp piping systems

Apr. 28, 2025

Do-It-Yourself Savings Project: Insulate Hot Water Pipes

Insulating your hot water pipes reduces heat loss and can raise water temperature 2°F–4°F hotter than uninsulated pipes can deliver, allowing you to lower your water temperature setting. You also won't have to wait as long for hot water when you turn on a faucet or showerhead, which helps conserve water.

With competitive price and timely delivery, Runlin sincerely hope to be your supplier and partner.

Paying for someone to insulate your pipes—as a project on its own—can make economic sense  . If there are uninsulated water pipes in or near exterior walls, they can burst in freezing weather, which can be catastrophic. Having the insulation done during new construction of a home, during other work on your water heater or pipes, or insulating the pipes yourself, is well worth the effort.

 In special cases, such as when the fuel used for heating water is very expensive, the distance traveled by the pipes is far, the pipes are exposed to very cold air (in which case they should be insulated anyway to prevent freezing), and if the household uses a lot of water, much higher energy savings can be obtained. In these cases, cost savings may offset paying for someone to do the job for you.

Source: Save Energy at Home, ENERGY STAR

BEFORE YOU START

  • Determine the type of insulation material you want to use, how much you will need (length of the pipes), and the size of the pipe (match the pipe sleeve's inside diameter to the pipe's outside diameter for a snug fit).
  • For electric water heaters, pipe sleeves made with polyethylene or neoprene foam are the most commonly used insulation.
  • On gas water heaters, insulation should be kept at least 6 inches from the flue. If pipes are within 8 inches of the flue, your safest choice is to use fiberglass pipe-wrap (at least 1-inch thick) without a facing. You can use either wire or aluminum foil tape to secure it to the pipe.

SHOPPING LIST

  • Tape measure
  • Pipe sleeves or strips of fiberglass insulation from your hardware store
  • Acrylic or duct tape, or cable ties, to secure the sleeves—or aluminum foil tape or wire to secure the fiberglass pipe-wrap
  • If using fiberglass pipe-wrap, use gloves and long sleeves and pants
  • Scissors, box cutter or utility knife for cutting the insulation
  • Headlamp or light if working in crawl space or dark area.

STEP-BY-STEP INSTRUCTIONS

1) Measure the pipes.

Starting at the water heater, measure lengths of insulation needed to cover all accessible hot water pipes, especially the first 3 feet of pipe from the water heater. It's also a good idea to insulate the cold-water inlet pipes for the first 3 feet.

2) Cut the pipe sleeve.

Cut the insulation to the lengths needed.

3) Place the pipe sleeve.

Place the pipe sleeve so the seam will be face down on the pipe.

4) Secure the pipe sleeve.

Tape, wire, or clamp (with a cable tie) it every foot or two to secure it to the pipe.

Fiberglass Pipe Insulation Thickness Guide for Steam - Hot Water

"What thickness fiberglass pipe insulation should I order?"

- This is a very common question we receive from our customers.

This is also a very good question, because we sell fiberglass pipe insulation from as thin as a half of an inch thick all the way up to two inches thick. The efficiency and the cost of these different thicknesses vary greatly, and it is important to insulate each pipe with the insulation thickness that is the most cost effective.

This guide will help you decide on which thickness of our fiberglass pipe insulation is best for your specific application. We have tried to make it as basic and easy to understand as possible. If you have any questions or concerns, please feel free to contact us to discuss your project further.

Please note that we break this guide out into two sections, Residential and Commercial. For your own home, there are no thickness requirements so you have more room for personal choice/budget. For our contractors installing our insulation in commercial buildings, there are more minimum thickness requirements if no specification is provided by the engineers.

RESIDENTIAL BUILDINGS:

Heating Pipes (Steam, Steam Condensate, and Hot Water):

This is by far one of our most popular residential uses of our fiberglass pipe insulation due to the large potential energy savings for homeowners. Having bare uninsulated heating pipes in your home is basically like burning money or flushing money down the drain (whichever way you want to look at it). The fastest and easiest way to reduce your heating costs (besides turning it off!) is insulating all of your heating pipes in your home. It doesn't matter what type of heating system you have, your steam, steam condensate, and hot water heating pipes should all be insulated with fiberglass pipe insulation.

In general there are no insulation thickness requirements for residential heating pipes, but we find that a minimum of 1" thickness is cost efficient in most scenarios. In almost every scenario involving a heating pipe, replacing 1/2" thickness pipe insulation with 1" thickness pipe insulation reduces the loss of heat transmission in half. On piping greater than 3" the use of 1-1/2" thickness is also cost efficient.

Our guide:

3" IPS and smaller: 1" thickness

3"IPS to 6"IPS: 1" thickness minimum / 1-1/2" recommended

8"IPS and above: 1-1/2" - 2" thickness recommended

Domestic Hot Water:

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For more frp piping systemsinformation, please contact us. We will provide professional answers.

This is your basic hot water pipe running off of your hot water heater. The temperature of these pipes is usually around 104°F to 120°F and by insulating these exposed pipes (unfinished basement/crawlspaces), you can reduce the amount of temperature loss from the Hot Water Heater to the Faucet. By limiting this heat loss, the temperature at the faucet will increase which will allow you to lower the temperature setting on the Hot Water Heater. A decrease in the amount of wasted water can also be noticed in certain situations where the standing hot water retains its temperature eliminating the need for it to be flushed in between uses. For example: After taking the first shower of the morning, the next person who takes a shower 10 minutes later will not have to run the hot water waiting for the water to turn hot.

In general there are no insulation thickness requirements for residential domestic hot water pipes, but we find that 1" thickness will greatly reduce the loss of heat transmission. Use of 1-1/2" or 2" thick fiberglass pipe insulation will most likely not be cost effective on domestic hot water unless the size of the pipe is greater than 3"IPS (not common in homes).

Cold Water (Condensation Control):

Cold water pipes should be insulated to prevent the buildup of condensation on the piping when they run through hot and humid spaces. Cold water pipes that have condensation problems can lead to health hazards such as mold and mildew growth in crawlspaces and unfinished basements. The thickness of pipe insulation for most common residential cold water pipes is 1/2" thick. There is usually no additional benefit of adding more than 1/2" thick fiberglass or rubber pipe insulation to cold water piping.

Hot & Cold Water (Freeze Protection):

When hot or cold water pipes are exposed to the elements the likelyhood of these pipes freezing is greatly increased. Refer to our Frozen Pipe Guide for more information on this subject.

COMMERCIAL BUILDINGS:

Heating Pipes (Steam, Steam Condensate, and Hot Water):

This is by far one of our most popular commmerical uses of our fiberglass pipe insulation due to the large energy savings for building owners. In most new building construction, the engineers will specify the thickness of fiberglass pipe insulation. For renovations or for projects with no thickness specifications it is best to follow ASHRAE 90.1 which provides the basic requirments for mechanical insulation. See Chart below:

Design  Operating Temp

    Mean Temp         °F

≤ 1" IPS

1-1/4" to 2" 2-1/2" to 4" Over 5" Above 350° 250° 2-1/2" 2-1/2" 3" 3-1/2" 251° - 350° 200° 2" 2-1/2" 2-1/2" 3-1/2" 201° - 250° 150° 1-1/2" 1-1/2" 2" 2" 141° - 200° 125° 1-1/2" 1-1/2" 1-1/2" 1-1/2" 105° - 140° 100° 1" 1" 1" 1-1/2"

*Chart shows minimum thickness to meet ASHRAE 90.1

Domestic Hot Water:

For domestic hot water systems use 1" thick fiberglass pipe insulation on pipes up to 2"IPS. Use 1-1/2" thick wall on pipes larger than 2" IPS.

*Minimum thicknesses to meet ASHRAE 90.1

Personnel Protection (Burn Protection):

This means insulating hot pipes to prevent accidental burning from touching non-insulated piping systems. The rule of thumb is that 1/2" thick will lower the surface temperature enough to prevent burning on pipes with operating temperatures of 300°F or less.   See below for piping with higher temperatures:

400°F - 1" thick

500°F - 1-1/2" thick

600°F - Pipe sizes up to 12" use 1-1/2" thick, and 2" thick for larger than 12"

800°F - Pipe sizes up to 3" use 2" thick, and 2-1/2" to 3" thick for larger than 3"

*Personnel Protection figures from Owens Corning Datasheet

Chilled Liquid Piping (Condensation Control):

This means insulating chilled water/liquid piping systems (refrigeration lines) to prevent condensation. To give a proper guideline, the RH (relative humidity) must be taken into consideration as well as the system's operating temperature and the ambient temperature (outside air temperature).   See Chart Below:

Ambient Temp Humidity Operating at 35°F Operating at 45°F Operating at 55°F 110°F 80% 1-1/2" 1-1/2" 1-1/2" 110°F 90% 3-1/2" 3-1/2" 3" 100°F 80% 1-1/2" 1-1/2" 1" 100°F 90% 3-1/2" 3" 2-1/2" 90°F 80% 1-1/2" 1" 1" 90°F 90% 3-1/2" 3" 2-1/2" 80°F 80% 1-1/2" 1" 1" 80°F 90% 3" 2-1/2" 2" 70°F 80% 1" 1" 1" 70°F 90% 2-1/2" 2" 1"

* Chart Information From Owens Corning Datasheet

If you are looking for more details, kindly visit Frp Pipe Fittings.

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