{"product_id":"simpson-strong-tie-zmax-galvanized-moment-post-base-for-8x8-w-sds-screws-mpb88z","title":"Simpson Strong-Tie ZMAX Galvanized Moment Post Base for 8x8 w\/ SDS Screws (MPB88Z)","description":"\u003csection data-aplus\u003e\n  \u003cdetails id=\"product-features\" class=\"acc\" open\u003e\n    \u003csummary\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003c\/summary\u003e\n    \u003cdiv class=\"acc-body\"\u003e\n      \u003cdiv class=\"features\"\u003e\n        \u003cdiv class=\"card\"\u003e\n          \u003cdiv class=\"card-inside\"\u003e\n            \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0933\/1582\/5958\/files\/anti-vibration.svg\" alt=\"anti-vibration\" class=\"aplusicon\"\u003e\n          \u003c\/div\u003e\n          \u003cdiv\u003e\u003cstrong\u003eMoment Resistance\u003c\/strong\u003e\u003c\/div\u003e\n          \u003cdiv class=\"feature-card\"\u003eThe overlapping sleeve design helps resist post rotation at the base. That matters when lateral loads hit the top of the post and you want a more stable connection without jumping to a custom-fabricated base.\u003c\/div\u003e\n        \u003c\/div\u003e\n        \u003cdiv class=\"card\"\u003e\n          \u003cdiv class=\"card-inside\"\u003e\n            \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0933\/1582\/5958\/files\/depth.svg\" alt=\"depth\" class=\"aplusicon\"\u003e\n          \u003c\/div\u003e\n          \u003cdiv\u003e\u003cstrong\u003eBuilt-In 1 Inch Standoff\u003c\/strong\u003e\u003c\/div\u003e\n          \u003cdiv class=\"feature-card\"\u003eTabs inside the Simpson Strong-Tie MPB88Z Moment Post Base hold the post 1 inch above the concrete. That gap helps reduce rot risk from standing water and ground moisture in outdoor builds.\u003c\/div\u003e\n        \u003c\/div\u003e\n        \u003cdiv class=\"card\"\u003e\n          \u003cdiv class=\"card-inside\"\u003e\n            \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0933\/1582\/5958\/files\/certifications.svg\" alt=\"certifications\" class=\"aplusicon\"\u003e\n          \u003c\/div\u003e\n          \u003cdiv\u003e\u003cstrong\u003eFaster Layout\u003c\/strong\u003e\u003c\/div\u003e\n          \u003cdiv class=\"feature-card\"\u003eStamped embedment indicators, template attachment holes, and the one-piece body simplify placement before the pour. Less layout guesswork means a cleaner install and fewer jobsite delays.\u003c\/div\u003e\n        \u003c\/div\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails id=\"product-overview\" class=\"acc\" open\u003e\n    \u003csummary\u003e\u003ch2\u003eOverview\u003c\/h2\u003e\u003c\/summary\u003e\n    \u003cdiv class=\"acc-body\" data-product-summary\u003e\n      \u003cp\u003eThe \u003cstrong\u003eSimpson Strong-Tie MPB88Z Moment Post Base\u003c\/strong\u003e is a cast-in-place post base for nominal 8x8 wood posts used in post-to-footing connections. This is a \u003cstrong\u003emoment post base designed for anchoring wood columns and posts to concrete footings while helping resist rotation at the base\u003c\/strong\u003e. Model Number: \u003cstrong\u003eMPB88Z\u003c\/strong\u003e. If you are building decks, fences, carports, or other outdoor structures where post stability and long-term durability matter, this connector is built for that job.\u003c\/p\u003e\n      \u003cp\u003eWhat separates the MPB88Z from a basic post base is its sleeve-style body. Simpson designed this patent-pending connector to encapsulate the post and provide moment resistance when lateral loads are applied at the top of the column or post. In plain terms, it gives designers and contractors a stronger starting point when they want to reduce bracing or open up sightlines without stepping into a custom base solution.\u003c\/p\u003e\n      \u003cp\u003eThe built-in 1 inch standoff tabs are not just a code detail. They keep the bottom of the wood post lifted above the concrete so water is less likely to sit against the end grain. That is a real-world durability feature, especially on exterior projects using treated lumber. Simpson also added weep holes so standing water can drain out and so you have a quick visual check point at the embedment line.\u003c\/p\u003e\n      \u003cp\u003eInstallation is set up to be straightforward. The one-piece design avoids the extra parts and assembly that slow down layout. Internal top-of-concrete tabs, stamped embedment indicators, and form board attachment holes help you place the base before concrete is poured. Once the concrete work is right, setting the post and fastening it is more predictable.\u003c\/p\u003e\n      \u003cp\u003eThis model is made from 12-gauge steel with a ZMAX coating. That combination gives you the stiffness expected from a structural connector plus corrosion resistance suited for many exterior and treated-wood applications. For contractors working on decks and exposed structures, that finish matters because the connector is doing its job outdoors, not hidden inside a dry wall cavity.\u003c\/p\u003e\n      \u003cp\u003eThe MPB88Z includes the specified Simpson Strong-Drive heavy-duty connector screws: 1\/4 inch x 3 inch SDS screws. Simpson is clear that those screws are part of the designed connection and that lag screws will not achieve the same load. That is worth paying attention to because it removes guesswork and keeps the installed connection aligned with the product's tested intent.\u003c\/p\u003e\n      \u003cp\u003eIn use, this connector is aimed at builders who need a heavy-duty 8x8 post base for concrete footings and who care about both structural performance and clean installation. It makes the most sense for deck builders, fencing crews, general contractors, and remodelers building outdoor living structures where post movement, moisture exposure, and install efficiency all matter. If you need a standard post base just to hold a post off the slab, this may be more connector than you need. If you need a purpose-built 8x8 moment post base with integrated standoff, drainage, and embedment guidance, this is the right kind of hardware.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails id=\"product-benefits\" class=\"acc\"\u003e\n    \u003csummary\u003e\u003ch2\u003eDesigned for Cleaner Layout and Drainage\u003c\/h2\u003e\u003c\/summary\u003e\n    \u003cdiv class=\"acc-body\"\u003e\n      \u003cdiv class=\"row\"\u003e\n        \u003cdiv class=\"img\"\u003e\n          \u003cimg src=\"https:\/\/ssttoolbox.widen.net\/content\/9r1ouovxfk\/jpeg\/C_MPB44Z_ProdIll_Ill_Prod_MomentPostBase_CY.jpeg?position=c\u0026amp;color=ffffffff\u0026amp;u=cjmyin\" alt=\"Simpson Strong-Tie MPB88Z Moment Post Base engineering-style diagram showing the sleeve body, embedment line, 1 inch standoff, and dimensional layout for an outdoor wood post to concrete footing connection\" class=\"tnblock-img\"\u003e\n        \u003c\/div\u003e\n        \u003cdiv class=\"copy\"\u003e\n          \u003cp\u003eThis connector is built to make placement easier before the pour and to help the finished base manage moisture better after the job is done. Those two details save headaches later, especially on exterior posts that see weather year-round.\u003c\/p\u003e\n          \u003cul\u003e\n            \u003cli\u003eStamped indicators and internal tabs identify the required concrete embedment depth\u003c\/li\u003e\n            \u003cli\u003eWeep holes at the embedment line allow water to exit and provide a visual inspection point\u003c\/li\u003e\n            \u003cli\u003eTemplate attachment holes simplify setup during form work\u003c\/li\u003e\n          \u003c\/ul\u003e\n        \u003c\/div\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails id=\"product-whats-included\" class=\"acc\" open\u003e\n    \u003csummary\u003e\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\u003c\/summary\u003e\n    \u003cdiv class=\"acc-body\"\u003e\n      \u003cdiv class=\"tnincluded-wrapper\"\u003e\n        \u003cul\u003e\n          \u003cli\u003e(1) Simpson Strong-Tie MPB88Z Moment Post Base for 8x8 posts\u003c\/li\u003e\n          \u003cli\u003e1\/4 in. x 3 in. Simpson Strong-Tie Strong-Drive SDS Heavy-Duty Connector screws\u003c\/li\u003e\n        \u003c\/ul\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails id=\"product-key-specifications\" class=\"acc\" open\u003e\n    \u003csummary\u003e\u003ch2\u003eKey Specifications\u003c\/h2\u003e\u003c\/summary\u003e\n    \u003cdiv class=\"acc-body\"\u003e\n      \u003ctable class=\"aplusspecs\"\u003e\n        \u003ctr\u003e\n          \u003cth\u003ePost Size\u003c\/th\u003e\n          \u003ctd\u003e8x8\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003cth\u003eMaterial\u003c\/th\u003e\n          \u003ctd\u003e12-gauge steel\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003cth\u003eFinish\u003c\/th\u003e\n          \u003ctd\u003eZMAX coating\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003cth\u003eWidth (W1)\u003c\/th\u003e\n          \u003ctd\u003e7 9\/16 in.\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003cth\u003eWidth (W2)\u003c\/th\u003e\n          \u003ctd\u003e7 9\/16 in.\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003cth\u003eHeight (H)\u003c\/th\u003e\n          \u003ctd\u003e7 1\/4 in.\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003cth\u003eDepth (D)\u003c\/th\u003e\n          \u003ctd\u003e7 1\/4 in.\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003cth\u003eIncluded Fasteners\u003c\/th\u003e\n          \u003ctd\u003e1\/4 in. x 3 in. Strong-Drive SDS Heavy-Duty Connector screws\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/table\u003e\n    \u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails id=\"product-compatibility\" class=\"acc\"\u003e\n    \u003csummary\u003e\u003ch2\u003eCompatibility\u003c\/h2\u003e\u003c\/summary\u003e\n    \u003cdiv class=\"acc-body\"\u003e\n      \u003cdiv class=\"compat-list\"\u003e\n        \u003cdiv class=\"compat-row\"\u003e\n          \u003cdiv\u003e\n            \u003cstrong\u003ePost Fit\u003c\/strong\u003e\n            \u003cdiv class=\"compat-detail\"\u003eDesigned for nominal 8x8 wood columns and posts.\u003c\/div\u003e\n          \u003c\/div\u003e\n        \u003c\/div\u003e\n        \u003cdiv class=\"compat-row\"\u003e\n          \u003cdiv\u003e\n            \u003cstrong\u003eApplication\u003c\/strong\u003e\n            \u003cdiv class=\"compat-detail\"\u003eBuilt for post-to-footing installations in concrete for decks and other outdoor structures.\u003c\/div\u003e\n          \u003c\/div\u003e\n        \u003c\/div\u003e\n        \u003cdiv class=\"compat-row\"\u003e\n          \u003cdiv\u003e\n            \u003cstrong\u003eFastener System\u003c\/strong\u003e\n            \u003cdiv class=\"compat-detail\"\u003eUses Simpson Strong-Drive SDS Heavy-Duty Connector screws. Simpson notes that lag screws will not achieve the same load.\u003c\/div\u003e\n          \u003c\/div\u003e\n        \u003c\/div\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails id=\"product-applications-uses\" class=\"acc\"\u003e\n    \u003csummary\u003e\u003ch2\u003eBuilt For\u003c\/h2\u003e\u003c\/summary\u003e\n    \u003cdiv class=\"acc-body\"\u003e\n      \u003cdiv class=\"tags\"\u003e\n        \u003cspan class=\"tag\"\u003eDeck Building\u003c\/span\u003e\n        \u003cspan class=\"tag\"\u003eFences\u003c\/span\u003e\n        \u003cspan class=\"tag\"\u003eCarports\u003c\/span\u003e\n        \u003cspan class=\"tag\"\u003eOutdoor Structures\u003c\/span\u003e\n        \u003cspan class=\"tag\"\u003ePost-to-Footing Connections\u003c\/span\u003e\n        \u003cspan class=\"tag\"\u003eGeneral Contracting\u003c\/span\u003e\n        \u003cspan class=\"tag\"\u003eRemodeling\u003c\/span\u003e\n        \u003cspan class=\"tag\"\u003eExterior Treated Lumber Work\u003c\/span\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails id=\"product-pro-tips\" class=\"acc\"\u003e\n    \u003csummary\u003e\u003ch2\u003ePro Tip\u003c\/h2\u003e\u003c\/summary\u003e\n    \u003cdiv class=\"acc-body\"\u003e\n      \u003cdiv class=\"tip-row\"\u003e\n        \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0933\/1582\/5958\/files\/specs.svg\" alt=\"specs\" class=\"icon-lg\"\u003e\n        \u003cp class=\"tip-text\"\u003eWhen you set the MPB88Z in concrete, keep the concrete level inside the connector no more than 1\/4 inch above the embedment line. That preserves the drainage path, which is one of the reasons this base holds up better outdoors.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails id=\"product-at-a-glance\" class=\"acc\"\u003e\n    \u003csummary\u003e\u003ch2\u003eAt a Glance\u003c\/h2\u003e\u003c\/summary\u003e\n    \u003cdiv class=\"acc-body\"\u003e\n      \u003cdiv class=\"stats-grid\"\u003e\n        \u003cdiv\u003e\n          \u003cdiv class=\"stat-value\"\u003e8x8\u003c\/div\u003e\n          \u003cdiv class=\"stat-label\"\u003ePost Size\u003c\/div\u003e\n        \u003c\/div\u003e\n        \u003cdiv\u003e\n          \u003cdiv class=\"stat-value\"\u003e12 Ga.\u003c\/div\u003e\n          \u003cdiv class=\"stat-label\"\u003eSteel Thickness\u003c\/div\u003e\n        \u003c\/div\u003e\n        \u003cdiv\u003e\n          \u003cdiv class=\"stat-value\"\u003e1 in.\u003c\/div\u003e\n          \u003cdiv class=\"stat-label\"\u003ePost Standoff\u003c\/div\u003e\n        \u003c\/div\u003e\n        \u003cdiv\u003e\n          \u003cdiv class=\"stat-value\"\u003e7 9\/16 in.\u003c\/div\u003e\n          \u003cdiv class=\"stat-label\"\u003eBody Width\u003c\/div\u003e\n        \u003c\/div\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails id=\"product-tool-nut-take\" class=\"acc\"\u003e\n    \u003csummary\u003e\u003ch2\u003eTool Nut's Take\u003c\/h2\u003e\u003c\/summary\u003e\n    \u003cdiv class=\"acc-body\"\u003e\n      \u003cdiv class=\"eyebrow\"\u003eTool Nut's Take\u003c\/div\u003e\n      \u003ch3\u003eSimpson Strong-Tie MPB88Z Moment Post Base Means Business\u003c\/h3\u003e\n      \u003cp\u003eThis is the kind of connector you buy when a basic post base is not enough and you want a cleaner, more thought-out solution for an exterior 8x8 post on concrete.\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eWho it's for:\u003c\/strong\u003e Contractors, deck builders, and serious DIYers building outdoor structures with nominal 8x8 posts and concrete footings.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eWhy it stands out:\u003c\/strong\u003e The sleeve design adds moment resistance, the 1 inch standoff helps fight moisture damage, and the built-in placement details make install more predictable.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eWorth knowing:\u003c\/strong\u003e This is a cast-in-place connector, so you need to plan it before the pour. Also, use the specified SDS connector screws, because Simpson explicitly says lag screws will not deliver the same load.\u003c\/li\u003e\n      \u003c\/ul\u003e\n    \u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails id=\"product-faqs\" class=\"acc\"\u003e\n    \u003csummary\u003e\u003ch2\u003eCommon Questions\u003c\/h2\u003e\u003c\/summary\u003e\n    \u003cdiv class=\"acc-body\"\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eWhat size post does this base fit?\u003c\/strong\u003e It is designed for nominal 8x8 wood posts.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eIs this a standard post base or a moment post base?\u003c\/strong\u003e It is a moment post base designed to help resist rotation at the base of a wood column or post.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eCan it be used outdoors?\u003c\/strong\u003e Yes. It has a ZMAX coating for exterior and treated-wood applications, and it includes a 1 inch standoff plus drainage features to help manage moisture.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eWhen is it installed?\u003c\/strong\u003e The MPB88Z is installed before concrete is placed as a cast-in-place connector.\u003c\/li\u003e\n      \u003c\/ul\u003e\n    \u003c\/div\u003e\n  \u003c\/details\u003e\n\u003c\/section\u003e","brand":"Simpson Strong-Tie","offers":[{"title":"Default Title","offer_id":52999300841766,"sku":"MPB88Z","price":310.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0933\/1582\/5958\/files\/MPB88Z_00707392509981_Product_Photo_01_7e3144dd-fbbc-4f11-a147-6f80679d4e42.jpg?v=1779135461","url":"https:\/\/www.toolnut.com\/products\/simpson-strong-tie-zmax-galvanized-moment-post-base-for-8x8-w-sds-screws-mpb88z","provider":"Tool Nut","version":"1.0","type":"link"}