Landmark Group of Builders

Edmonton, Canada

Landmark Group of Builders

Edmonton, Canada
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Mah D.,Natural Resources Canada | Manrique J.D.,Urban Landmarks Master Builder | Yu H.,Landmark Group of Builders | Al-Hussein M.,Natural Resources Canada | Nasseri R.,Landmark Group of Builders
Construction Innovation | Year: 2011

Purpose - This paper aims to establish a baseline for carbon dioxide (CODN 2/DN) emissions quantification in the current residential construction process. Opportunities to reduce the environmental footprint of the homebuilding process are also identified. Design/methodology/approach - CODN 2/DN emissions of various house construction stages are quantified and utilised in a 3D building information model. This allows rapid emission computations for various house sizes, designs and materials. An intelligent database calculates emissions for different house styles with different construction processes. Findings - Two construction stages (basement walls foundation and framing) were identified as high CODN2/DN emissions contributors. In addition, equipment operation on site, transportation to and from the site and heating for curing concrete were identified as the main sources of emissions during construction. Originality/value - The paper addresses the limited attention given to CODN 2/DN emissions during the actual construction process. The introduction of building information modeling for quantifying emissions in the construction process is of significant value. This research is pertinent to the international homebuilding industry and homebuyers who all have a role in mitigating CODN2/DN emissions. © 2011 Emerald Group Publishing Limited. All rights reserved.

Manrique J.D.,University of Alberta | Al-Hussein M.,Natural Resources Canada | Bouferguene A.,University of Alberta | Safouhi H.,University of Alberta | Nasseri R.,Landmark Group of Builders
Journal of Construction Engineering and Management | Year: 2011

As a result of elevated labor costs, a shortage of trades personnel, and a lack of efficient construction methods, many construction companies in western Canada waste primary materials. In general, these firms suffer from a lack of effective construction guidelines and process standardizations. This paper focuses on the use of a mathematical algorithm, referred to here in this paper as CUTEX, which maximizes the use of wood materials for platform-framing residential construction. In particular, CUTEX is designed to reduce waste by generating a cutting list for wood studs and sheathing (oriented strand boards-OSB). A combinatorial analysis algorithm has been developed and applied to determine the best cutting procedure for wood stick frame houses. Restrictions, such as nominal lumber dimensions and sizes encountered in the North American market, were taken into account. A two-dimensional optimization for sheathing layout has also been developed to minimize the disposal of OSB boards, making the construction process leaner and more economical. A direct and positive impact on the environment and a reduction in construction costs are expected as a result of reducing the amount of primary materials utilized. © 2011 American Society of Civil Engineers.

Yu H.,Landmark Group of Builders | Al-Hussein M.,University of Alberta | Al-Jibouri S.,University of Twente | Telyas A.,Kullman Building Corporate
Journal of Management in Engineering | Year: 2013

Encouraged by the remarkable productivity improvements in the manufacturing sector, the construction industry has a long history of trying to garner the benefits of manufacturing technologies. Whereas industrialized construction methods, such as modular and manufactured buildings, have evolved over decades, core techniques used in prefabrication plants vary only slightly from those employed in traditional site-built construction. The objective of this research was to develop and implement a production system for the effective application of lean tools in building components prefabrication. To overcome the prevalent skepticism among middle management, the lean journey started with a pilot project involving one production line. Over a six-month period, lean tools such as 5S (sort, straighten, shine, standardize, and sustain), standardized work, takt time planning, variation management, and value stream mapping were implemented to a communication shelter production line. The implementation successfully won the support of the middle managers and established the foundation for expanding lean practices to other parts of the factory and applying relevant lean tools and techniques. © 2013 American Society of Civil Engineers.

Li H.X.,University of Alberta | Naseri Esfahani M.,University of Alberta | Gul M.,University of Alberta | Yu H.,Landmark Group of Builders | And 2 more authors.
Construction Research Congress 2014: Construction in a Global Network - Proceedings of the 2014 Construction Research Congress | Year: 2014

Compared with the conventional stick-built construction method, panelized construction offers greater sustainability in terms of energy, waste, and emissions reduction. The empirical research presented in this paper addresses the carbon footprint of panelized construction by quantifying and comparing the carbon emissions during the framing stage between panelized and conventional stick-built construction methods. The data for quantifying the emissions of panelized construction are collected from a prefabrication plant, Landmark Building Solutions (LBS), whereas the data for conventional construction are drawn from previous research of one of the coauthors. The framing phase of panelized construction, including panel fabrication in the plant, panel transportation to the site, and panel erection onsite is investigated and compared with the stick-built method. The associated emission comparison includes operational emissions and embodied emissions; the former has to do with direct emissions during fabrication and construction, and the latter is related to resources during the process, measured in terms of embodied emissions. Different research methods, such as reviews of accounting records and discussion with experts in a task-group setting, are customized to different elements. The research results indicate that carbon emissions are reduced significantly through the use of a panelized construction method compared to the conventional stick-built method. © 2014 American Society of Civil Engineers.

Li H.,University of Alberta | Yu H.,Landmark Group of Builders | Turnbull D.,Landmark Group of Builders | Gul M.,University of Alberta | And 2 more authors.
ICCREM 2015 - Environment and the Sustainable Building - Proceedings of the 2015 International Conference on Construction and Real Estate Management | Year: 2015

Energy consumption due to residential building operation is a crucial issue in cold-climate regions. In order to alleviate the energy demand from residential building operation, the concept of NetZero energy homes (NZEHs) has emerged as a solution. Appropriate design of the building envelope for NZEHs, (including insulation type and thickness, configuration, and other parameters), is a key to ensuring a high level of energy performance of NZEHs, and energy simulation provides a tool to investigate the energy performance of design options for each component of the NZEH building envelope. HOT2000, which is a widely used energy simulation tool in Canada, is used for energy simulation in this research; in order to achieve the goal of simulation automation, the batch version of HOT2000 is utilized. The energy performance of design options is simulated for such main components of NZEH building envelope as main wall, exposed floor, attic, basement wall, and basement floor, and, based on the simulation results, the functions and charts of energy performance are developed for these components. This research contributes to the body of research in this area by analyzing the energy performance of design options for NZEH building envelope. © 2015 ASCE.

Younes B.,University of Alberta | Bouferguene A.,University of Alberta | Al-Hussein M.,University of Alberta | Yu H.,Landmark Group of Builders | Ajweh Z.,University of Alberta
Proceedings, Annual Conference - Canadian Society for Civil Engineering | Year: 2013

Construction contractors stipulate payment terms for invoices submitted. These terms are often ignored, in which case invoices are paid late, leading in the long-term to lost profit and compromised relationship and reputation for both contractors and owners. Two particular challenges are identified in this research: (1) delayed payment of invoices and (2) inefficient processing of invoices. Considering that for a typical construction firm invoice processing involves a number of full-time employees and several stages, the effect of inefficient invoice processing on project cost cannot be ignored. From the construction owner's perspective, ensuring on-time payment of invoices, even when funds are available, can be a challenging exercise because of the variety, volume, and the unpredictable nature of demand for the invoices to be processed. As a result, it is paramount for owners to implement not only processing protocols which will ensure efficient treatment of invoices but, more importantly, quality assurance procedures which will minimize the amount of rework in the process. The approach proposed in this paper considers invoice processing as a supply chain to which Lean manufacturing principles and simulation are applied in order to reduce (or ideally, eliminate) waste in the process, thereby achieving a steady-state supply chain with minimal queuing and processing time.

Awad H.,University of Alberta | Gul M.,University of Alberta | Zaman H.,University of Alberta | Yu H.,Landmark Group of Builders | Al-Hussein M.,University of Alberta
Energy and Buildings | Year: 2014

Approximately 30% of energy use in Canada is consumed in buildings, specifically space heating, which can be reduced by constructing thermally-resistant building envelopes. This study evaluates potential innovative energy-efficient wall systems for mid-rise (four to six storeys) wood-frame buildings in terms of thermal and structural performances. Regarding the thermal resistance performance, four wall systems are developed, installed in a full-scale test house, and examined, along with a baseline wall system, using the field data collected. The selection of the wall systems is based on current practice, structural analysis, pre-fabricability, and energy-efficiency. Several sensors are installed on each wall system to measure temperature, heat flow, and relative humidity. In addition, structural tests are conducted to determine the compressive loading capacity of the tested wall systems for both concentric and eccentric loads, where full-scale panels are constructed and tested in laboratory. As a general finding, all the tested wall systems achieved ASHRAE's minimum assembly R-value recommendation of RSI 3.45, where the I-joist wall system had the highest R-value, while the conventional wall system had the highest load-bearing capacity. This paper recommends I-Joist wall systems for their higher energy efficiency suggesting more future research on efficient end connections to achieve consistent structural performance. © 2014 Elsevier B.V. All rights reserved.

Hamdan S.B.,University of Alberta | Barkokebas B.,University of Alberta | Manrique J.D.,Landmark Group of Builders | Al-Hussein M.,University of Alberta
32nd International Symposium on Automation and Robotics in Construction and Mining: Connected to the Future, Proceedings | Year: 2015

Off-site construction is gaining more consideration from builders in North America, as it provides better quality products in less time and cost. Panelized construction is an increasingly popular off-site construction method in which panels are fabricated off site, then transported to the site for assembly. In this approach, panels are typically manufactured at a rate that exceeds that of on-site assembly of the panels, which necessitates inventory management of the fabricated panels awaiting transportation to the site for assembly. Effective inventory management is thus required in panelized construction to reduce costs. The randomness of the manufacturing and assembly process entails processing a large amount of information iteratively in order to select the proper production scenario to effectively manage the inventory. In this context, simulation provides an appropriate means of testing proposed scenarios in a timely manner. Simulation models require precise information, and building information modelling (BIM) provides a convenient and comprehensive means of data exchange among different environments. This paper thus presents a combination of discrete-event and continuous simulation that uses the information extracted from the BIM model to facilitate inventory management for panelized construction. This approach develops a schedule and ensures continuity and smoothness of the workflow.

Barkokebas B.,University of Alberta | Hamdan S.B.,University of Alberta | Al-Hussein M.,University of Alberta | Manrique J.D.,Landmark Group of Builders
32nd International Symposium on Automation and Robotics in Construction and Mining: Connected to the Future, Proceedings | Year: 2015

The current on-site (stick-built) construction process is hampered by inefficiencies and limited in terms of opportunities for technological innovation. The efficiency of on-site construction practice is contingent upon the effectiveness of the specific model used to communicate information. Architects use CAD models to develop a project design, while construction engineers use management tools and spreadsheets to assist in project estimating control and integration. Today, the efficiency of this process is dependent upon the ability of project participants to interpret these discipline-specific models in order to form mental pictures of a proposed design and manually perform material take-offs and estimating. This process contributes to misinterpretation and subsequent estimating errors. Advanced computer tools can be used to prepare smart designs which integrate these models and coordinate the crossdisciplinary tools used for design and cost estimating. The research described in this paper is intended to support the industrialized (manufactured) construction process of residential buildings, coordinating cross-disciplinary knowledge through the utilization of building information modelling (BIM)-based 3D-paremateric modelling. A case study is also presented in this paper in order to illustrate the effectiveness of the methodology and highlight potential applications of the 3D BIM model.

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