This calculator will help you determine the proper amount of stain and prepping supplies needed to refinish your deck using TWP 100 or TWP 1500 Series.

 

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

 

You will get two prepping results. You need one, not both options:

  • First will offer the Gemini Restore Kit. This will be used for new, gray, dirty decks and for applying TWP over an intact older coating of TWP.
  • Second is the 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.

 

If you have questions as to which to use, please ask below.

 

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  • We will reply to your comment shortly
    JTP · 04/19/2015
    We will be recyling old redwood decking by planing first. So, this will be old wood but with a new surface. Do i prep as old wood with open pores, or do I have to go through the wetting cycles of new wood? I plan to seal before applying the decking so treating as old wood is much easier.
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    Mark Shipp · 04/18/2015
    My 25 year old pressure treated pine fence has never been cleaned or stained. It is being power at this moment. The cleaner is using an industrial strength liquid sodium hypochlorite solution under low pressure to pre-wet, then powering it off. n It is looking great. do I still need to use the whole Gemini prep kit, or just the brightener/neutralizer? How long will it need to dry before Applying the TWP 100?
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    TWP Stains · 04/17/2015
    richlife :
    I've previously used TWP 100 and 1500 series on my deck. A contractor has said to use the 200 series. Can you explain why he would choose this (I see that it has more pigment)? Is the coverage the same (100-200 sq ft)?

    The 200 Series is for Shakes and Shingles. Better to use the 100 or 1500. It does not have more pigment but more solids.
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    Rich Beaudry · 04/16/2015
    I've previously used TWP 100 and 1500 series on my deck. A contractor has said to use the 200 series. Can you explain why he would choose this (I see that it has more pigment)? Is the coverage the same (100-200 sq ft)?
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    TWP Stains · 04/12/2015
    tim meyer:
    Please help us determine what products we need.
    We have a 1100 sq ft green treated deck that was stained over 10 years ago. We need to strip the old stain, address the black mildew areas and re-stain. Do we need a cleaner, stripper and brightener? Our main goal is durability and longevity. We live in Minnesota so the environment is harsh.

    You need the RAD Stripper and Brightener for the prep. You do not need the cleaner. Use the 100 Series.
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    tim meyer · 04/12/2015
    Please help us determine what products we need.
    We have a 1100 sq ft green treated deck that was stained over 10 years ago. We need to strip the old stain, address the black mildew areas and re-stain. Do we need a cleaner, stripper and brightener? Our main goal is durability and longevity. We live in Minnesota so the environment is harsh.
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    TWP Stains · 04/06/2015
    Mark Shipp:
    I live in Cookeville, TN 38501 (between Nashville and Knoxville) I have a privacy fence, built with pressure treated 5/4 decking boards for the verticals, up for about 12 years. It never been stained or painted, or washed. I plan to use a Wagner sprayer that will feed directly out of a bucket to apply the stain,thenback-brush. I have about 3,588 square feet, that is cleaning and staining both sides. I'm thinking maybe the Redwood color stain. (1)what do I need to clean with, and how much will I need? (2)Which stain is the best for me to use, and how much will I need? (3)What is the total cost of everything I will need to get from you? Thank you, Mark

    Prep with the Gemini Kit. You will need about 4 of the kits for this amount. Use the 100 Series and you will need about 25-40 gallons for 2 coats applied wet on wet. The large difference in amount is based on how dried out your wood is. All prices are on the links above.
  • We will reply to your comment shortly
    Mark Shipp · 04/06/2015
    I live in Cookeville, TN 38501 (between Nashville and Knoxville) I have a privacy fence, built with pressure treated 5/4 decking boards for the verticals, up for about 12 years. It never been stained or painted, or washed. I plan to use a Wagner sprayer that will feed directly out of a bucket to apply the stain,thenback-brush. I have about 3,588 square feet, that is cleaning and staining both sides. I'm thinking maybe the Redwood color stain. (1)what do I need to clean with, and how much will I need? (2)Which stain is the best for me to use, and how much will I need? (3)What is the total cost of everything I will need to get from you? Thank you, Mark
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    TWP Stains · 04/03/2015
    Fern Cottage:
    16x24 deck
    Iron rails but wood corner posts (10)

    About 400-500 total sq. feet.
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    Fern Cottage · 04/03/2015
    16x24 deck
    Iron rails but wood corner posts (10)
  • We will reply to your comment shortly
    TWP Stains · 04/03/2015
    Jason Mac:
    I want to dip 600 2x6x8' fence boards. How many gallons do you think I will need to do this??

    AND will I need a second coat if they are dipped?

    Jason, please supply us with a total sq. footage of the wood for all sides. In addition is this wood smooth or rough sawn? If rough sawn you can do this. If smooth you cannot. Please read this about new wood: http://www.twpstainhelp.com/prepping-new-wood-for-twp-stains/
  • We will reply to your comment shortly
    Jason Mac · 04/02/2015
    I want to dip 600 2x6x8' fence boards. How many gallons do you think I will need to do this??

    AND will I need a second coat if they are dipped?
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    TWP Stains · 03/26/2015
    Barry Behrens:
    I have a 14x20 ft shed that is 1-1/2 years old. The outside walls are 8ft with a 11in overhang and gable roof. It has rough 4in vertical grooved plywood (similar to T1-11) with a very light dry stain. I plan on staining on darker color. How should this be prepped and how much stain?

    What is the total sq. footage of wood that is being stained? If you have an older stain then you will need to remove that with the RAD Stain Stripper and Rad brightener when done.
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    Barry Behrens · 03/25/2015
    I have a 14x20 ft shed that is 1-1/2 years old. The outside walls are 8ft with a 11in overhang and gable roof. It has rough 4in vertical grooved plywood (similar to T1-11) with a very light dry stain. I plan on staining on darker color. How should this be prepped and how much stain?
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    TWP Stains · 03/21/2015
    Elena Strickland:
    My deck has an apron on it. It does not have a railing because it is only 6 inches off the ground.
    The deck is 30 feet wide and 16 feet deep.
    Can you let me know how much product to purchase?

    You have about 500 sq. feet so 1 of the 5 gallon pails should be enough for this and two coats.
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    Elena Strickland · 03/21/2015
    My deck has an apron on it. It does not have a railing because it is only 6 inches off the ground.
    The deck is 30 feet wide and 16 feet deep.
    Can you let me know how much product to purchase?
  • We will reply to your comment shortly
    TWP Stains · 03/18/2015
    Ben Moore:
    Can I assume your calculator is for one side of the deck? I have a raised deck and must stain underneath as well as the surface. Should I double the square footage?

    Yes you would need to roughly double.
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    Ben Moore · 03/18/2015
    Can I assume your calculator is for one side of the deck? I have a raised deck and must stain underneath as well as the surface. Should I double the square footage?
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    TWP Stains · 03/11/2015
    Susanne Shalit:
    I have an atrium area which previously had a hot tub. I would like to redo the deck floor with a stain. Right now, I have done several things, but not sure what to do. It appears to have multiple types of wood, but I am not sure. The part near the door looks like redwood, the other part looks like fir. I have power washed all, cleaned the part near the door with oxygen type bleach. What can I do to make it look even? I would like a stain to show the wood, but with a nice redwood color. The closeup is the most current picture.

    You will probably need to power sand the wood to even out the color then brighten all when done. Even then it will not be perfect but it will be better.
  • We will reply to your comment shortly
    Susanne Shalit · 03/11/2015
    I have an atrium area which previously had a hot tub. I would like to redo the deck floor with a stain. Right now, I have done several things, but not sure what to do. It appears to have multiple types of wood, but I am not sure. The part near the door looks like redwood, the other part looks like fir. I have power washed all, cleaned the part near the door with oxygen type bleach. What can I do to make it look even? I would like a stain to show the wood, but with a nice redwood color. The closeup is the most current picture.