Calculator

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

If you have questions, please ask below.

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  • We will reply to your comment shortly
    Mary M · 07/01/2014
    Lakefront, VT, cedar siding. Restored and stained with TWP 7 years ago. Now mildew, dirt and uneven fading. What needs to be done to get best results with TWP 1500 series?
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    TWP Stains · 07/01/2014
    David McDonough:
    Two years ago I used Cabot's oil based sealer on our deck. It has now worn off. Water does not stand on the wood after a rain which it should do if protected. Can I stain over this old coating without having to strip it off? I have done that job before and will not do that again.

    No you need to remove the Cabot if you want to switch brands of stain. Beading water is not needed for outside wood and is a myth. You need to shed water and allow the wood to breathe.
  • We will reply to your comment shortly
    David McDonough · 06/30/2014
    Two years ago I used Cabot's oil based sealer on our deck. It has now worn off. Water does not stand on the wood after a rain which it should do if protected. Can I stain over this old coating without having to strip it off? I have done that job before and will not do that again.
  • We will reply to your comment shortly
    TWP Stains · 06/30/2014
    Alex S:
    Hi,
    I just built a ~1,100 sq feet pool deck with 160 linear feet perimeter surrounded by 4 feet tall fence. The fence is composed of 4X4 posts spaced 6 feet each. Each section has 2 horizontal 2X4 ribs on top and bottom and 18 2X2 vertical planks.

    It is a little difficult to use the calculator to figure out the necessary amounts I need to buy.

    Please help me figure this out.

    What is the total sq. footage of the wood?
  • We will reply to your comment shortly
    Alex S · 06/30/2014
    Hi,
    I just built a ~1,100 sq feet pool deck with 160 linear feet perimeter surrounded by 4 feet tall fence. The fence is composed of 4X4 posts spaced 6 feet each. Each section has 2 horizontal 2X4 ribs on top and bottom and 18 2X2 vertical planks.

    It is a little difficult to use the calculator to figure out the necessary amounts I need to buy.

    Please help me figure this out.
  • We will reply to your comment shortly
    TWP Stains · 06/24/2014
    Scott Thomas:
    I live in Atlanta GA. Part of my deck is covered and part is not. The uncovered part is shady most of the time therefore we have a challenge with mildew. Is TWP my best option?
    I have hired a contractor to clean and stain my deck. I am not sure he has used TWP before, and I am slightly concerned he may mis-apply the "wet on wet" 2 coat process. Is that process relatively common? Would most contractors know how to do this properly? Any further advice or detailed instructions for application would be appreciated. Thanks, Scott

    Please read this about wet on wet application:
    http://www.twpstainhelp.com/twp-stain-wet-on-wet-application/

    Use the 100 Series for Atlanta.
  • We will reply to your comment shortly
    TWP Stains · 06/24/2014
    Larry Smith:
    Just completed new pressure treated deck. We live in GA. The deck gets overhead sun about 8 hours a day in summer. Would you suggest 100 or 1500. I have grandkids that play on the deck. Also what color would you suggest for letting the grain shoe through? One more question...one or two coats for first application? Thanks

    Use the 100 series and all the colors will allow the grain to to show through. Just one coat. Please read this about new wood:
    http://www.twpstainhelp.com/prepping-new-wood-for-twp-stains/
  • We will reply to your comment shortly
    Larry Smith · 06/24/2014
    Just completed new pressure treated deck. We live in GA. The deck gets overhead sun about 8 hours a day in summer. Would you suggest 100 or 1500. I have grandkids that play on the deck. Also what color would you suggest for letting the grain shoe through? One more question...one or two coats for first application? Thanks
  • We will reply to your comment shortly
    Scott Thomas · 06/23/2014
    I live in Atlanta GA. Part of my deck is covered and part is not. The uncovered part is shady most of the time therefore we have a challenge with mildew. Is TWP my best option?
    I have hired a contractor to clean and stain my deck. I am not sure he has used TWP before, and I am slightly concerned he may mis-apply the "wet on wet" 2 coat process. Is that process relatively common? Would most contractors know how to do this properly? Any further advice or detailed instructions for application would be appreciated. Thanks, Scott
  • We will reply to your comment shortly
    TWP Stains · 06/19/2014
    Marianne Peyton:
    We are re-staining an older deck. We have 528 square feet and would like to use the 1500 series product(unless you have a better suggestion) in redwood color. We are first-timers and pretty much clueless to this process.

    All directions for the prep can be found here. It varies as if you have an old coating to remove or not:
    http://www.twpstainhelp.com/tips/prepping-for-twp-stains/
  • We will reply to your comment shortly
    Marianne Peyton · 06/18/2014
    We are re-staining an older deck. We have 528 square feet and would like to use the 1500 series product(unless you have a better suggestion) in redwood color. We are first-timers and pretty much clueless to this process.
  • We will reply to your comment shortly
    TWP Stains · 06/17/2014
    Christina:
    I have an untreated douglas fir deck that has weathered for about 9 months since it was installed. I have about 1500 sq ft of deck plus the railing (which will be new in a few weeks. We will let it dry and weather before we finish it).

    What is the process for getting the best results. Do I need to use the cleaner and brightener first? How much do I need?

    I believe I want to use the TWP 1500.
    Thank you.
    Christina

    Please read this article about new wood:
    http://www.twpstainhelp.com/prepping-new-wood-for-twp-stains/

    Just one coat for new wood. 2 of the 5 gallon pails and two of the Gemini Kits.
  • We will reply to your comment shortly
    Christina · 06/16/2014
    I have an untreated douglas fir deck that has weathered for about 9 months since it was installed. I have about 1500 sq ft of deck plus the railing (which will be new in a few weeks. We will let it dry and weather before we finish it).

    What is the process for getting the best results. Do I need to use the cleaner and brightener first? How much do I need?

    I believe I want to use the TWP 1500.
    Thank you.
    Christina
  • We will reply to your comment shortly
    TWP Stains · 06/09/2014
    Dennis Campion:
    what is the total cost for 5 separate gals of dark stain, Gemini Restorer & cleaner and Brightner? Sales tax for Illinois and Shipping (assuming the order would not exceed $100?

    Add products to cart and enter shipping info for total cost. No sales tax is charged.
  • We will reply to your comment shortly
    Dennis Campion · 06/09/2014
    what is the total cost for 5 separate gals of dark stain, Gemini Restorer & cleaner and Brightner? Sales tax for Illinois and Shipping (assuming the order would not exceed $100?
  • We will reply to your comment shortly
    TWP Stains · 06/03/2014
    Reed Parker:
    does your calculator include the underside of the deck?

    No it does not.
  • We will reply to your comment shortly
    Reed Parker · 06/02/2014
    does your calculator include the underside of the deck?
  • We will reply to your comment shortly
    TWP Stains · 06/02/2014
    Giuseppe:
    Hello,
    I wanted to know if the TWP1500 is oil based or water based.
    Also I wanted to know which one is the transparent one.. I am looking to keep the original look of my brand new california redwood deck, so little staining. I could not find a 'clear' option. Finally, how much do I need for ~850sqt... and if I should clean the deck first ( it is brand new fresh redwood)

    Thank you!
    Giuseppe

    Oil based. The 1500 does come in clear but clear has no UV protection from graying. You will need to choose of the semi-transparent colors. Please read this about new wood:
    http://www.twpstainhelp.com/prepping-new-wood-for-twp-stains/
  • We will reply to your comment shortly
    TWP Stains · 06/02/2014
    Frank C:
    25 year old ceder deck. I just sanded the floor and the top of the railings (80 grit) everything else is fine. Did it 2 yrs ago with Behr semi transparent stain.Do I need more prep and what color do u recommend - ceder tone or natural

    Either color will work well. Use the Gemini Restore Kit after the sanding.
  • We will reply to your comment shortly
    Giuseppe · 06/02/2014
    Hello,
    I wanted to know if the TWP1500 is oil based or water based.
    Also I wanted to know which one is the transparent one.. I am looking to keep the original look of my brand new california redwood deck, so little staining. I could not find a 'clear' option. Finally, how much do I need for ~850sqt... and if I should clean the deck first ( it is brand new fresh redwood)

    Thank you!
    Giuseppe