TWP Deck Stain Calculator

by Administrator

These calculations will help you determine the square footage for the proper amount of stain and prepping supplies needed to refinish your deck or fence using TWP 100 or TWP 1500 Series.

This is intended to provide you with an approximate estimate only. Material requirements may vary according to application method, surface condition, and weather conditions.

Prepping Options

  • Gemini Restore Kit. This will be used for new, gray, dirty decks and for applying TWP over an intact older coating of TWP.
  • Restore-A-Deck Stripper and Restore-A-Deck Brightener. This is used for removing old coatings of stain. Use this if you are switching from a different brand to TWP or if you have a neglected coating of TWP that has failed unevenly.

Deck Sq. Footage

Flooring Length x width =?

Railing Length x height =?

Steps Width x Depth x #of Steps =?

Add up all 3 for the Total Sq. footage.

Fence Sq. Footage

Length x height =?

Multiply x 2 for both sides = Total Sq. Footage

Coverage Rate for TWP Stains

The specified coverage rate for TWP is 150-200 square feet per gallon for the first coat. Second will apply at 200-300 per gallon. This averages to about 100-125 sq. feet per gallon for 2 coats wet on wet. From this, and from measuring the surface you can calculate how much stain you need. For more aged wood you could easily factor in some extra stain. On newer wood that is still smooth and dense, you probably are not going to use as much.

For maintenance coats you are not going to use near as much stain as you did initially staining bare wood. There are just way too many variables to know the exact coverage rate of TWP for sure. There is really no way of knowing exactly how much stain you will need. It is better to buy more than you need than to not have enough. You can always save left over stain for next time. TWP has a shelf life of 1 year if opened and 3 years unopened as long as the can is properly resealed.

If you have questions, please ask below.

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Peter
Peter
12 days ago

Please explain math in this statement of yours:
“The specified coverage rate for TWP is 150-200 square feet per gallon for the first coat. Second will apply at 200-300 per gallon. This averages to about 100-125 sq. feet per gallon for 2 coats wet on wet.”
How did you arrive the average of 100-125 sq. ft., but not 175-250 sq. ft per gal each coat?

TWP Stains
Admin
12 days ago
Reply to  Peter

You need to treat each coat individually, not the average of the two.


Example Deck that is 500 Sq feet:

The first coat applies at 150-200 sq. feet per gallon. You would use 2/3 (a little over 3 gallons) of the 5-gallon pail.
The second coat applies at 200-300 sq. feet per gallon. You would use about 1/3 (1-2 gallons) of the 5-gallon pail.

*When done, you used around 5 gallons for 500 Sq. feet or around 100-125 sq. feet per gallon for the 2 coats needed.

Peter
Peter
12 days ago
Reply to  TWP Stains

I see your logic. Actually, your example would produce 85-120 sq ft/gal coverage, 2 coats, accordingly for the lower coverage numbers of 150 and 200 sq. ft, and for the higher coverage numbers 200 and 300 sq. ft.

One can calculate the coverage for 2 coats by using this formula:

2 coats coverage = Cov.1st x Cov.2nd / Cov.1st + Cov.2nd).

Check it out.

Then, divide your area into that number, to calculate total gal qty. of the needed material.

Clint McDowell
Clint McDowell
8 days ago

I live in Michigan and my deck is a 20 year old pressure treated deck. I used twp 116 but it’s been a good 6 years or so since the last time I treated the deck (100 is no longer allowed). It sits in full sun for about 4-6 hours a day and is uncovered. Was thinking of changing to your semi-solid for a little better protection. Unless the 1516 would give just as much protection. The deck surface along with the stairs comes out to about 400 sqft.
Which product would you recommend, how much, and is power washing a good prep?
Thanks for your help!
Clint

17202970998561207797338641820095
TWP Stains
Admin
8 days ago
Reply to  Clint McDowell

Use the Gemini Restore Kit and pressure washing for prep. Either the 1500 Series or the Semi-solid Low-Voc will work well here. Up to you.

Paul
Paul
11 days ago

Hello. Live near Buffalo NY. I have a two year old pressure treated 12X12 ground-level ‘deck’. More of a platform. What kind and quantity of TWP Stain would you recommend?
Thanks.

TWP Stains
Admin
10 days ago
Reply to  Paul

Use this for prep:
https://www.twpstain.com/gemini-s-restore-a-deck-cleaner-and-brightener-kit

Then stain with the TWP 1500 Series. 2 Gallons.

Pat
Pat
23 days ago

Ca I use semi solid for first coat on old and new wood for the fence with 1500 for second coat

TWP Stains
Admin
23 days ago
Reply to  Pat

No.

Pat
Pat
22 days ago
Reply to  TWP Stains

Why

TWP Stains
Admin
21 days ago
Reply to  Pat

It will not dry or cure correctly.

TWP Stains
Admin
21 days ago
Reply to  TWP Stains

In addition, it would look terrible.

Andy R
Andy R
25 days ago
  1. Pls confirm – do you recommend 2 coats”wet on wet”? Assume wet on wet means wait 30 mins or so, then apply 2d coat?
  2. The guy helping me cautioned not to use products that “flammable”in any way. Assume once applied TWP stain does not make the wood more flammable. ?

Thanks

TWP Stains
Admin
24 days ago
Reply to  Andy R

1. Correct.
2. Is not considered flammable but combustible and only in liquid form and only if you do something incorrect like leave a soaking wet rag in the sun. Once applied and dry it is no different than any other stain and has zero chance of starting a fire.

Angela Vines
Angela Vines
25 days ago

What is the difference in the series: 100, 1500?

TWP Stains
Admin
25 days ago
Reply to  Angela Vines

VOC compliance for certain states. Where do you live?

David B
David B
26 days ago

What is the average shelf life of TWP

TWP Stains
Admin
26 days ago
Reply to  David B

12 months if opened and 36 months unopened.

Barry K.
Barry K.
1 month ago

I have a 420 SF deck plus two flights of stairs with a total of twenty-four steps that are 10″ deep and 46″ wide. I am most interested in a semi solid stain but would consider a solid stain. The deck is about 26 years old, and I sanded off all the old pain…tedious but true. Even with sanding there are color variations a bit. How much and what type of stain would be best?

TWP Stains
Admin
1 month ago
Reply to  Barry K.

Barry, please add up all the flooring, railings, and steps to a total sq footage and let us know that amount. How do that is in above article.

Barry K.
Barry K.
1 month ago
Reply to  TWP Stains

No railings as they are aluminum. SF on the steps of about 84SF so a total of about 500 SF with the deck boards.

TWP Stains
Admin
1 month ago
Reply to  Barry K.

Okay, look at are semi-solid colors. Since you sanded, just one coat of stain. About 3 Gallons.

Mike K
Mike K
1 month ago

When it says do not apply when over 90degrees …. is it OK to apply in the morning when its 82 and stop when it hits 90? Or is this meant to say “if the daily high is to exceed 90 degrees, don’t do it”. I’ve got a new fence in Texas and it’s already hot.

TWP Stains
Admin
1 month ago
Reply to  Mike K

Yes, that is okay. It is more of an issue with horizontal wood not vertical wood like a fence.

Bill piercs
Bill piercs
1 month ago

I have a red wood deck that is 9 years old we just power washed it and when I applied the 1500 clear product the deck is coming out very dark almost black. Will it lighten up as it dries?

TWP Stains
Admin
1 month ago
Reply to  Bill piercs

It should a little as it dries and cures.

Bill piercs
Bill piercs
1 month ago

What happens if it rains on the deck the day after you apply 1500 clear

TWP Stains
Admin
1 month ago
Reply to  Bill piercs

Nothing to be concerned with as long as it was dry before the rain came.

Clay
Clay
1 month ago

Hello, have a cedar fence which is 19 years old. We bought the house about 5 years ago and fence was completely gray; pressure washed it and stained with your TWP100 Cedar Tone & it looked great!

It is time to re-stain (see attached photo). Questions:

  1. Should I apply your “Gemini Restore” first, or what would you recommend for prep?
  2. Should I use the TWP100 again or the TWP1500?
  3. Square footage is 1,400 square feet, could you advise on quanities required?

Thank you.

Fence
TWP Stains
Admin
1 month ago
Reply to  Clay

1. Yes, correct.
2. Same 100 Sereis unless there has been VOC changes in your state.
3. 10-15 gallons.

Brent
Brent
1 month ago

I have 400 total how many gallons

TWP Stains
Admin
1 month ago
Reply to  Brent

3-4 gallons for two coats applied wet on wet.

Ed B
Ed B
1 month ago

Had my deck coated two years ago with TWP 200 (Butternut 207) Part of the deck is covered which looks good. The uncovered needs to be rejuvenated. Will it need to be stripped if using the same color?

Also, can the underside of the deck be stained with 200 series?

TWP Stains
Admin
1 month ago
Reply to  Ed B

Hello, to have it even we would suggest stripping and brightening for prep. You can do the undersides if you like but it is not needed.

Dave Rhodes
Dave Rhodes
1 month ago

I have 800 sq ft of deck, how much stain do I need

TWP Stains
Admin
1 month ago
Reply to  Dave Rhodes

About 6-8 gallons for the 2 coats applied wet on wet.

Martha
Martha
1 month ago

It has been raining alot, almost every day and we are finally getting some sunny days. Our deck is new as of last August so it has been through almost one year of seasoning. How many sunny days should we wait before putting on a coat of stain? And how many sunny days should we have after?
Also, I used a deck cleaner two weeks ago. Is there anything else I should do before staining? It is pressure treated pine.

TWP Stains
Admin
1 month ago
Reply to  Martha

Needs to dry for 48 hours afetr rain or prep. No rain for 8-12 hours after applying. Stain within 2 weeks of prep. If longer give it a good pressure wash rinse.

SL_PA
SL_PA
1 month ago

Is one coat enough for a re-stain of the same stain after a strip and brighten?

TWP Stains
Admin
1 month ago
Reply to  SL_PA

Apply 2 coats wet on wet.

Dave
Dave
2 months ago

12 x 12 treated wood deck. Railings don’t need staining. Five 4’ stairs. No VOC restrictions. Looking for gray to med. gray. No mildew or algae. I think I would have to do the underside as well. Do I need to scuff or sand? Which product and how many gallons do you think I’ll need? Thank you

TWP Stains
Admin
2 months ago
Reply to  Dave

Look at the TWP Semi-solid dor gray colors. One to two gallons. No need to stain undersides.
https://www.twpstain.com/twp-semi-solid-stain-1-gallon

Alan
Alan
2 months ago

Hello. I ordered 2 gallons of TWP 200 Series a few years ago to have my deck restained. The company that installed the deck used TWP 200 because of the color they recommended – California Cedar. It doesn’t come in the other TWP formulas.

2 questions:
Is there any disadvantage to using TWP 200 on a deck rather than siding?
A previous quote measured the deck area to be 527 sq ft. The last time it was stained it only took about 1 1/2 gallons or so. Does that sound right?

TWP Stains
Admin
2 months ago
Reply to  Alan

No, just takes longer to dry and cure. It should take about 2-3 gallons for 527 sq feet and 1 coat.

B F
B F
2 months ago

Hi. My cedar deck has been stained with your Cedar Gold 203 stain professionally every 3 years , twice so far. The deck is almost 600 sq ft. This year I plan to stain it myself. How much Stain should I buy

TWP Stains
Admin
2 months ago
Reply to  B F

About 3-4 gallons for 1 coat.

Last edited 2 months ago by TWP Stains
Donna
Donna
2 months ago

Our home has two levels of decks. The upper deck is brand new pressured wood installed 5 months ago. Should I use the 100 series or 1500? The lower deck was stained 4 years ago and just needs touched up. My plans were to scrub and lightly pressure wash the lower deck and just add 1 coat of the same color (black walnut) to freshen it up. Will that work or do I have to get all the stain off the lower deck? Is your Semi-solid you’d recommend on both decks. Thank You.

TWP Stains
Admin
2 months ago
Reply to  Donna

Where do you live? You will need to use the Gemini Restore Kit for the upper level deck which means you should use the same prep for the lower level. If you want to switch to semi-solid, you will need to strip and brighten the lower level.

Donna
Donna
2 months ago
Reply to  TWP Stains

Thank you for your quick response. We live in Georgetown, KY. We would prefer not to strip the lower deck, it’s about 400 SF. If we don’t use the Semi-solid product on upper and lower, what product can we use. I’m a little confused on the 100 series and the 1500 series. Which would I use? The color we now have is 1504 Black Walnut, which I didn’t see in your color selection. Please confirm the product I should use. Thank you.

TWP Stains
Admin
2 months ago
Reply to  Donna

If you used the 1500 (1504 Black Walnut) Series before then you should stick with it unless you want to strip.
https://www.twpstain.com/twp1500-5gallon

Nola
Nola
2 months ago

Hi! How much Semi Solid stain would I need to purchase to cover 1,800 rough sawn red cedar siding? Also, I will be having this shipped to a freight forwarder for Alaska. Do you guys label your shipping boxes noting “hazardous/flammable material”? Thank you!

TWP Stains
Admin
2 months ago
Reply to  Nola

Hello,

For one coat, you would need roughly 7-10 Gallons. Might be best to get 2 5-gallon pails. There are not any hazardous labels on the boxes or containers and it can be shipped via freight forwarders.

Mike Friedman
Mike Friedman
2 months ago

I need to cover 2400sq ft fence rough cut western red cedar in 1500 Honeytone . It is aged about 6 months by the time it’s warm enough. How much should I get?

TWP Stains
Admin
2 months ago
Reply to  Mike Friedman

20-25 gallons for the 2 coats applied wet on wet.

Diane
Diane
2 months ago

can twp be used to stain a bamboo fence

TWP Stains
Admin
2 months ago
Reply to  Diane

Only the 300 series and we do not carry that series on our site.

Ryan J
Ryan J
2 months ago

Is it best to cover both sides of my fence (the side in my neighbors yard too) for longest life? I have apx. 1,350 sq ft of fence (2,700) if doing both sides. And my deck is apx 250 sq ft. How much 100 would I need?

TWP Stains
Admin
2 months ago
Reply to  Ryan J

Yes, do both sides of a fence, and always best to do it all at the same time. For 3000 sq. feet and doing 2 coats applied wet on wet, you will need about 25-30 gallons of stain.

Harry P
Harry P
3 months ago

Looking at TWP 100 series for staining rough cut cedar fence. Fence installed autumn 2023.. applying 1 coat. How much stain required?

TWP Stains
Admin
3 months ago
Reply to  Harry P

What is the sq footage?

Harry P
Harry P
3 months ago
Reply to  TWP Stains

Sorry, completely forgot to include. 1600 sq ft.

TWP Stains
Admin
3 months ago
Reply to  Harry P

About 7-9 gallons. Rough-sawn wood can be very absorbent so coverage is less.

Maxime Morin
Maxime Morin
3 months ago

I’ve a 500 sq/ft deck…12 years old never stained. How much gallon I need of twp 200 (im in Canada)

TWP Stains
Admin
3 months ago
Reply to  Maxime Morin

3-4 gallons for one coat.

Maxime Morin
Maxime Morin
3 months ago
Reply to  TWP Stains

OK does two coats is needed based on the informations I provided?

TWP Stains
Admin
3 months ago
Reply to  Maxime Morin

If you do 2 coats applied wet on wet, you will need about 5 gallons. It depends on how dried out and absorbent your wood is.

Maxime Morin
Maxime Morin
3 months ago
Reply to  TWP Stains

Thank you very much for the Quick reply

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