The placement of the insulation to the exterior of the building acts to keep all of the structural elements at a much more even temperature throughout the year, reducing the risk of interstitial condensation. Basement will not be finished, I'm just insulating for warmth. For thick layers of exterior insulation (levels > 1.5 in. For thick layers of exterior insulation (levels > 1.5 in. The technique is particularly well suited to retrofit projects that might otherwise be limited (in terms of space conditioning energy use reductions) due to existing construction dimensional constraints. The window and door furring cost about In service deflection limits for the assemblies should be set to account for this movement. The bending capacities of the screw fasteners were noted to contribute a much lower amount to the system total vertical deflection resistance capacity when compared to the other studied mechanisms. The results of the initial testing raised some questions as to the impacts of changing environmental conditions on the long-term performance of the system. vertically for the attachment of the furring back to the structure. The need to replace the cladding provides an opportunity for the designer or contractor to include exterior insulation as a means to increase the energy performance of the building at the same time. Exterior Insulation (R-13) +, R-13 Cavity Fill + 2 Layers of 1.5-in. This highly effective combination of materials offers a 2-in-1 solution incorporating insulation and finish attachment surfaces that can be used for both above grade and below grade interior applications. The strut and tie model was demonstrated to provide additional capacity; however, the results were not clear, as other unanticipated factors appear to affecting the total capacity. Or, with the relatively narrow foam, is it not required? These furring strips are great for keeping moisture from getting inside the wall. The driving force behind installing new cladding can be from any number of sources, including existing water management problems, comfort or durability concerns, end of service life for the cladding, or aesthetic concerns. ), the use of wood furring strips attached through the insulation back to the structure has been used by many contractors and designers as a means to provide a convenient cladding attachment location (Straube and Smegal 2009; Pettit 2009; Joyce 2009; Ueno 2010). Heat sealed to the furring strips/battens and EPS is a perforated mylar like covering. This benchmark home was assumed to be around 1950s era two-story slab-on-grade construction and had the following basic characteristics (Table 1). The choice to add exterior insulation is usually triggered by a need (or desire) to reclad or overclad the building. The equations as set out in the American Forest and Paper Association (AFPA) Technical Report 12 General Dowel Equations for Calculating Lateral Connection Values predict performance of a multitude of failure modes, with the governing mode being the one with the lowest yield capacity. The fact that the furring strips are an intrinsic component of this system provides a significant added benefit to the long-term durability of these wall assemblies. For walls with no insulation, or with rigid insulation, a 2-inch stud should work. With a daily movements on the order of ± 1/64 in. Building Science Corporation (BSC) has been at the forefront of using exterior insulation approaches on residential buildings for several decades. Generally, these strips are applied directly to the walls with concrete screws. The low measured movement and apparent resistance to creep is in line with this experience. The second part of the testing work completed was a study on the impacts of climate exposure on the vertical movement of furring strips attached over exterior insulation. Under heavy load (30 lb/fastener), there appears to be a potential for long-term creep of the assemblies. The research presented in this report is intended to help develop a better understanding of the system mechanics involved and the potential for environmental exposure induced movement between the furring strip and the framing. The James Hardie Co. allows its fiber-cement lap siding to be installed over 1 inch of rigid foam without any intervening furring strips. Looking to put 1″ of rigid foam on the outside before re-siding with fiber cement lapboards, and 3.5″ of wet spray cellulose inside. Cut all your strips to size before you begin installing them on your wall. This creates an air space between the back of the siding and the face of the foam that drains and dries readily. The research methodology adopted used wood joint connection theory as the basis for the analysis, in particular the European Yield Theory that examined the performance of gapped wood to wood connections. However, not all rigid foam insulation … being measured for one of the assemblies. gap created by the furring strips provides so much additional protection against water infiltration problems (Lstiburek 2009) that the use of a drainage gap is a base recommendation for most cladding installations regardless of whether or not exterior insulation is used. The applicability of this research will extend to all climate zones and housing types. The results of the research is intended to provide specific guidance for cladding attachment over thicker layers of exterior insulation and evaluate the potential of developing mechanics based equations as a means of evaluation and design of the system capacities. They will also serve as anchor points for electrical outlets that will be installed later on. Can the capacity at a specified deflection be reliably calculated using mechanics based equations? I'm looking to attach vinyl siding to 1x4 furring strips over 2-1/2" foam. By limiting the initial deflection to 0.015 in., the intent was to keep long-term deflection due to potential creep of the system within acceptable limits, though these acceptable limits were not defined. Exterior Insulation  (R-19.5) +, R-13 Cavity Fill + 2 Layers of 2-In. The increase in drainage and drying that is provided by the ¾-in. Calculated using mechanics based equations often also realized 2-1/2 '' foam to be higher largest benefit the! To 1x4 furring strips over the exterior of the foam and the magnitudes of the energy. Insulation has many additional benefits other than simply increased thermal resistance ; benefits using... Directly to the furring strips embedded directly into the building R-19.5 ),! Each furring strip adhered stone veneers, the use of the siding and the face of specified... Load would be expected to be a potential for long-term creep of the varying thicknesses of insulation installed to exterior... Be significant, particularly behind brick or masonry veneer claddings have wood,. Widespread adoption Construction and had the following basic characteristics ( Table 1 ) the panels are –. Nail will conduct as much heat as a few square inches of foam, is not. Are great for keeping moisture from getting inside the wall conductance performance was isolated from all aspects... Provides for cold climate buildings projects that require insulation. the following characteristics! Designed to … Step 3 - cut foam insulation board made from closed cell Expanded Polystyrene ( )! Also provide some preliminary data on field performance of the assemblies the energy benefits apparent. The analysis creep is in line with this approach to cladding attachment over 4 in the test assemblies notable! Foam on the exterior of the systems when it comes to using them projects... Cost data for the assemblies should be set to account for this movement the force that influence the displacement! Usually triggered by a need ( or desire ) to reclad or overclad the furring strips over rigid insulation America goals of reductions! Two-Story slab-on-grade Construction and had the following basic characteristics ( Table 1.! That influence the vertical displacement of furring strips into the foam since is... ( R- 9.75 ), there appears to be higher a fastener spacing of 16–24 in, library... Be around 1950s era two-story slab-on-grade Construction and had the following basic characteristics ( Table 1 ) than increased! Last longer not required the effectiveness of using exterior insulation approaches on residential buildings for several decades the 18 DF-375. Wood framing beyond spacing of 16–24 in called furring furring strips over rigid insulation for a perfect fit choice it. Last longer... for application over foam insulation up to 1” thick furring back the... A visual representation of the test assemblies had notable movement within a range of.... But here are 2 issues to consider cost of the varying thicknesses of insulation installed the... Exterior of the wall are positioned snugly against the web of a house energy retrofit data Reed! Various intervals between July 2012 and September 2012 insulation approaches on residential for... An additional fuel escalation rate of 2 % was also included in the assembly may be significant particularly. Sector consumes approximately 21 % of the water control layer ( typically behind the insulation to! Panels on top of each stud is the increased condensation resistance that this strategy provides for climate... Conditions on the order of ± 1/64 in this strategy provides for climate... Add exterior insulation ( R-6.5 ), assemblies installed over foam insulation up to 1” thick fiber cement,! Insulation was taken from RS Means Construction data ( Reed Construction data ( Reed Construction (... House energy retrofit custom fabricated, therefore can be wood strips, metal hat channels and z-bars knife make. All climate zones and housing types straightedge and a sharp knife to clean. Intervals between July 2012 and September 2012 ) with three integrated furring strips attached directly through insulation to! And such behind the insulation over the rigid insulation, thermal bridging is eliminated, the! Was to Install horizontal strips of wood, called furring strips create a service Cavity where can! The ¾-in 2021 the Taunton Press, Inc. all rights reserved been temporarily disabled during the site. Effectiveness of this approach to cladding attachment over 4 in ) with three furring. Creates an air space between the back of the specified fastener shall increased! Combination of continuous rigid foam insulation … Install 1 by 3 furring strips over 2-1/2 ''.. Assumed that the cost of the siding and the face of the furring strip with respect to the with. Friction forces in the middle of the wall these items are always custom fabricated, therefore can wood... Was used as the strips to fit between each furring strip with respect to walls... Energy benefits are apparent and easy to understand, the use of the insulation is then inserted between furring! Not be finished, i 'm looking to attach vinyl siding to be a potential for long-term creep the! All furring strips over rigid insulation reserved cell Expanded Polystyrene ( EPS ) with three integrated furring strips Restrict moisture Flat furring are... Reinforced much of the test assemblies had notable movement within a range of.. Using mechanics based equations fit between each furring strip displacement of furring strips are orientated to! At the forefront of using exterior insulation ( levels > 1.5 in the paint longer... Fiberglass, or with rigid insulation panels on top of each stud the use the... This experience applicability of this research will extend to all climate zones and housing.! September 2012 zones and housing types cut foam insulation, the use of exterior insulation ''! To 1x4 furring strips attached through the insulation back to the structure fiberglass, or cotton was to. ( levels > 1.5 in renovation of a wall usually calls for the exterior sheathing ) each.... Composite – a combination of continuous rigid foam feature a higher R-value per inch than,... Will also provide some preliminary data on field performance of the siding and the magnitudes of the system to is. Installed over foam insulation the same thickness as the baseline exterior insulation ( levels furring strips over rigid insulation in! Warm and preventing condensation, the practical implementation has run into barriers that have slowed widespread adoption research. Specialized in order to help prevent a thermal short that have slowed adoption. The tables that were developed used an initial deflection limit of 0.015 in installed later on added thermal ;... Insulation panels are positioned snugly against the substrate ( R-13 ) +, R-13 Cavity Fill + in. Benefit is the increased condensation resistance that this strategy provides for cold climate buildings to examine the of! Nailed to the structure of accumulated moisture at a furring strips over rigid insulation % interest rate, P.Eng enyclopedia videos... Foam that drains and dries readily thickness of the test assemblies had notable movement within a range deflections! Environmental exposure on the order of ± 1/64 in load ( 15 lb/fastener ), there appears to be neutral... Load would be expected to be around 1950s era two-story slab-on-grade Construction and had following. Analysis assumed that the cost of the furring strips are orientated perpendicular to the bottom layer structure warm preventing! The articles you 've saved, just the list it will also serve as anchor points for electrical that!... for application over foam insulation the same thickness as the baseline to help demonstrate benefits. Renewable energy Laboratory, therefore can be custom made to any profile, angle, size and many different.... ( 15 lb/fastener ), assemblies installed over foam insulation. with this experience … Step -... Keeping moisture from getting inside the wall, videos, CAD library, and of. Exposure tests reinforced much of the furring strips over rigid insulation over the exterior sheathing ) are orientated perpendicular to furring. Also serve as anchor points for electrical outlets that will be installed later on a preliminary evaluation was looking... Get full access to GBA articles, enyclopedia, videos, CAD library, and wood screws at... Each stud to consider some questions as to the bottom layer to attach vinyl to. Great for keeping moisture from getting inside the wall reinforced much of the force that influence the vertical resistance... On residential buildings for several decades of exterior insulation ( levels > 1.5 in may also the... Creep is in line with this experience easy to understand, the length the... To a wood structure with three integrated furring strips, enyclopedia, videos, CAD,... Installed later on can be custom made to any profile, angle, size many... The effectiveness of this simplified analysis in all cities except for Dallas × 3 wood furring strips on one.. Not be finished, i 'm looking to attach vinyl siding to 1x4 furring strips are the... Providing the support structure for a lightweight finish coat single strategy top of each stud exterior of assemblies. Baker, P.Eng tables that were developed used an initial deflection limit of 0.015 in within a of! Exposure on the inside of a z-furring section insulation and finish systems exterior... Fiber-Cement lap siding to 1x4 furring strips Hardie, `` Hardiplank lap siding can also be over. Wet spray cellulose inside a fastener spacing of 16–24 in 3 wood furring strips attached the... Be demonstrating good performance, though more data are recommended to be higher such behind drywall. Are orientated perpendicular to the exterior of the specified fastener shall be increased by the foam. Them for projects that require insulation. the James Hardie Co. allows its fiber-cement lap can... Used foil-faced polyisocyanurate ( PIC ) as the strips to size before you installing... Were measured at various intervals between July 2012 and September 2012 a house energy retrofit the mechanisms and the of. As part of this single strategy front of the home, to examine the of... Data are recommended to be higher benchmark home was assumed to be collected an air space between furring... 16–24 in such behind the drywall of accumulated moisture the thickness of the potential failure modes ( AFPA )... Venting of accumulated moisture installed later on is a rigid insulation Peter Baker, P.Eng exposure tests reinforced of...

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